I think if you go into knowing that you have a challenging schedule and you'll need to stay on top of things from a time management standpoint, you're in good shape. I get the impression that those who are prepared for this, and know it going into it, often do quite well. If you're motivated - which you clearly are - and you want to do it, I bet you'll be fine. More than fine. :) It sounds like an exciting schedule! More power to you!