I think everyone's responses have been on the money, and I fully agree that the basic science isn't as important as having a good foundation in A&P. Having that knowledge base will be tremendous benefit to you. You really don't want to be relearning A&P while you're trying to learn pathophys, assessment and a hundred other things, trust me, I know from personal experience. The good news is that even with a weak A&P foundation weighing me down, I'm still hanging in there, so being weak in that area does not have to preclude you from succeeding. I've certainly had to bear down and put in the time, but I'm making it and I fully expect to graduate in September!
As the others have already said, time management is a huge factor, and in my opinion it plays just as much of a role as the academics. I'm not a fast learner (my ability for wrote memory is horrible!) and I feel like I'm behind my peers most the time, that being said I honestly haven't found any of the material to be over my head or too complex in any way. If you've gotten into the program you don't have to be a wiz kid, you CAN learn the material so don't worry about that, the problem is there's just so darn much of it squeezed into such a short amount of time! So figuring out how to tackle the work early on and study efficiently, as well as possessing tenacity and endurance, will serve you well.
Definitely there are downers about the program, but there are many great things too, and if I were in the same circumstances I'd probably do it again. Just know you're in for a challenge, but it's a challenge that can be overcome. Nobody can really prepare you for the experience no matter how much you hear about it in advance, it's just something you have to walk through and experience for yourself, because it's going to be what you make of it.
Good luck and fear not, just "keep your eye on the prize" as they say!