Welcome curvesforlife!!
I haven't checked out the DVD's yet - but a buncha gals here have.
Here is a thread where they talked about it. Jillian's DVD's are based on front (chest, quads, shoulders, triceps and abs) and back (glutes, back, biceps, hamstrings and obliques). She has you do the front on one day and the back the next with a rest day after. That way you get 4 days a week of weight training with time in between for your muscles to recover. (An extra day of cardio is added in to make it a 7 day plan.
I just did Friday of Week 10 - it kicked my butt....especially when I got to the gym and found out I forgot the bottom half of my outfit...I tried to do my workouts in jeans...needless to say it wasn't a great idea. But there were no blowouts!
Cardio tomorrow and then I think I'm going to skip the rest day to attempt to get my old schedule back.