I say give week 2 a try. When I was going through the early weeks, I'd find that I'd almost feel comfortable with the routine by the 3rd run of the week, and then it'd step it up again. Don't feel discouraged if you can't complete it on day 1, even if it doesn't feel like it, it's made you more prepared for the next time you get out there.

I never repeated a whole week, but did repeat days I couldn't complete. Bad days are normal, once you accept that they'll actually encourage you to get out there and do better next time.

Progress may come slowly, but it'll come. Stick with it.