I just did the first C25K workout today! I'm getting ready for a 5K at the end of June - super excited
I did the whole program two years ago and loved it, but fell off the running bandwagon after that. It definitely got me to running the full 5K (although I was still slow as heck!). I agree with the recommendation above to repeat weeks if you need to, and would toss in that calf stretches post-workout are a must. I like to write the alphabet with my toes twice on each side after running and do strength training on other days when I'm not running to prevent shin splints.
Good luck - you can do this!!!