(CNN) -- Amy Braun-Gross had been counting the hours until January 1. It wasn't her birthday, nor was it her anniversary.
January 1 was the first day she'd be eligible to get health insurance.
That's what she thought anyway.
As soon as the Obamacare marketplaces opened in October, the Wisconsin stay-at-home mom tried to log into the website. It crashed. Repeatedly. She said she tried seven or eight times.
"I kept seeing the news stories that said it was supposed to get smoother, but I'd get all the way to the end of signing up and it would crash again," Braun-Gross said.
She ended up calling the marketplace's official phone bank. That did the trick, but it still took weeks for the paperwork to get to her so she could finally pick a plan. Despite the aggravation she said having health insurance will totally be worth it.
Having previously been denied insurance because of pre-existing conditions, including her weight, she has worried every day for the year she has lived without it. She wonders what would happen if she or her husband got sick; he has a physically demanding job running a tree-cutting business.
"You know something as simple as a sprained ankle, none of that is covered right now. None of it," Braun-Gross said. "To add the cost of that to the debt we already have, we'd basically be up a creek."
Braun-Gross is like more than 48 million other Americans who weren't eligible or didn't have enough money to pay for health insurance in the past.
Obamacare is supposed to change all that. The law forbids insurance companies from rejecting people like Braun-Gross because of their pre-existing conditions. To make that affordable, though, the administration had to require all Americans, with a few exceptions, to buy a health insurance policy. That part of the law went into effect this year.
The idea is that more healthy people will buy insurance, and the money the insurance companies save on them will cover the costs of insuring the older and sicker people who will now be in the system.
Some 2.1 million have gotten private health insurance in the first three months of open enrollment. And nearly 1 million signed up for Obamacare in the first weeks of January alone, according to the administration.
Employers will provide health insurance for three out of every five Americans in 2014, according to the Congressional Budget Office. Another 12% will get it through Medicaid or the Children's Health Insurance Program.
But for those Americans without insurance, a central feature of Obamacare -- health insurance marketplaces, also known as exchanges -- can make a big difference in helping them find a plan. Many are eligible for government assistance to pay for those plans.
With so many politicians fighting over this controversial legislation, and with all the computer glitches, the details about how to sign up may have gotten a little lost. More than half of Americans still don't know about the important Obamacare deadlines, according to a survey commissioned by Bankrate.com.
You've got until Wednesday January 30 to sign up if you want coverage to start on March 1.
Here's what you need to know:
Open enrollment runs through March 31. Plans bought through the exchanges this month won't start until the next.
In most of the country December 24 is the cutoff date if you want your plan to start on January 1. On Monday, the administration said it was extending the December 23 deadline for another day.
America's Health Insurance Plans, the health insurance industry trade group, said consumers now have until January 10 though to make their first payment for coverage retroactive to January 1. If you sign up after that in January or February your coverage will start the following month. The enrollment period closes March 31 and won't re-open until October 15.
When Massachusetts rolled out a similar health insurance mandate in 2007, the biggest spike in enrollments came in the two months before people would be charged a penalty for not having coverage, according to Jon Kingsdale, who ran the state's health benefit exchange then. He also noticed many people came back to the state's website to evaluate the potential plans more than once.
The experts advise you to take your time. Comparison shop to find the policy that works best for you.
Where to start
If you have Internet access, start with the Web. Healthcare.gov will have the information you need. The government site will link to where you sign up for the program.
There have been challenges with these websites, but the Obama administration said December 16 that the issues should be resolved.
If you can get into the website, go first to "get insurance." That tab will get you to a page that will walk you through whatever marketplace is available to you. Some states set up their own; the federal government runs the rest. On this site you can also compare the plans available in your area.
You may also want to see if you are eligible for Medicaid here. So far, 26 states have decided to expand who is eligible for the federal government-funded health program for lower income families and individuals. Four others are currently considering expansion.
You can also enroll by mail.
The government has set up call centers to help people with open enrollment. Call 1-800-318-2596 (TTY: 1-855-889-4325). The number is staffed around-the-clock. Information is available in more than 150 languages.
There will also be specially trained advisers in communities. These "navigators," as they are known, can help you in person. There will also be federally authorized marketplace-designated organizations. They will be based in community health centers, at the mall, in drug stores and in churches. Depending on state law, traditional agents and insurance brokers can also help.
If you would like to find a navigator, go to Localhelp.healthcare.gov. The government site lets you plug in your ZIP code and it will give you the closest location to get help. The website will list the phone number, the address, the e-mail address, the website address, the office hours, and details on how they can help.
Unlike brokers or agents, navigators and marketplace-designated organizations can educate you about the plans, but they cannot tell you which plan to pick. Their advice is free. If someone who is a navigator or a federally designated organization tries to charge you, it is a scam.
The health care plans
There are several. The bronze level will be basic, silver midrange, while gold and platinum will be higher-end. There will also be a catastrophic option. Catastrophic insurance covers three doctor visits per year at no cost and preventive care such as screenings and vaccines. This plan will carry a higher deductible.
All plans bought through the exchanges must offer the same coverage benefits. All offer free preventive care. Nearly all cap out-of-pocket costs to $6,350 and $12,700 per family. No one can be turned away. No one will be penalized because of their gender (women often paid more in the old insurance system). Only smokers may be penalized in some plans and some older people may pay more.
What varies with the plans is cost. Some will carry higher deductibles. Some ask for higher co-pays. Costs will vary based on where you live. If you want to see what your bill may look like, be sure to check out the premium estimate tool on HHS.gov.
The majority of people uninsured today can find a policy for $100 or less a month, taking into account subsidies and Medicaid eligibility, according to the Obama administration.
The good news is if you go through the exchanges rather than buy directly from an insurance company, you will likely be eligible for tax breaks and subsidies to pay for your insurance. The assistance is available to those with incomes of up to four times the federal poverty level -- this year, that's $45,960 for an individual or $94,200 for a family of four -- and will be calculated on a sliding scale.
You can take this subsidy as a tax credit or the government will pay the insurance company directly.
Some Americans will be exempt from the health insurance mandate, according to the Congressional Budget Office.
These are people who can't afford it: For example, people who make so little they don't have to file a tax return are exempt.
People who are in this country without authorization are exempted, as are members of a federally recognized American Indian tribe who are eligible for services through an American Indian health care provider and people with certain religious beliefs that conflict with acceptance of the benefits of private or public insurance.
People with certain hardships are also exempt; so are people in states that don't expand Medicaid.
If you don't get insurance
If you don't sign up to get insurance, you'll list that on your 2014 tax return.
The fee for the first year is $95 per adult and $47.50 per child (up to $285 per family), or 1% of your income, whatever is higher.
In 2015, it jumps to 2% of your income, or $325 per adult and $162.50 per child. In 2016, it will jump to 2.5% of your income.
While some may rather pay the small fee the first year than pay premiums that would cost more, experts predict most people will sign up for insurance.
"I think the penalties should be higher, but they are still enough to make the law effective," said Jonathan Gruber, an economist at MIT who was an architect on both the Massachusetts and U.S. health plans. "In Massachusetts we had people flooding in to sign up. You know Americans are almost uniquely law-abiding people, we massively overpay our taxes in terms of what people do in the rest of the world. When you say it is the law to have health insurance I think people will get health insurance."
Enroll America, a nonpartisan nonprofit that is helping educate Americans about the program, said it has had a positive response once people have an explanation of what's coming.
"For the most part, the people we encounter are thrilled that they will finally have health care," said Enroll America's Jessica Barbara Brown. "For many people this will be the first time they have ever had access to care. This can be life-changing."
Amy Braun-Gross agrees. Her health insurance will come just in time as she, like her husband, will take on a physically demanding job next month. She is going to be a fitness instructor.
"Not having insurance because of the pre-existing conditions got me thinking -- I want to be healthier," Braun Gross said. "I'm losing weight, feeling healthier and now if something were to happen I'll be covered."