I started the Couch to 5K program a few months ago. I stretched it out because on some weeks, I just did not feel ready to move on, so I repeated the previous week. When I started, I didn't think I'd make it through the first five minute run, but now I'm up to 28 minutes of running! This is the longest I've ever run at one time in my entire life.
So I just wanted to say -- stick with the program, because it really does work! It's a great way to get moving. Don't be afraid to take longer and repeat a week every once in a while. Better to do that than to burn out because you are pushing yourself too hard!