You can always stretch it out if you need to...some folks repeat weeks just to give themselves a chance to get used to it. I think I did around weeks 4 and/or 5. Just take it at your own pace and you will do it. You've got great motivation and I'm sure you'll have success. It does get easier; you are training your body to get used to it bit by bit.
"If you drop an egg, you don't say, 'Oh, shoot' and drop the other 11, do you?"
-Source unknown, but obviously brilliant
Reached goal 4/16/2010...but kind of afraid to look these days