P90X: 1st week completed

So I've started this P90x program (I'm doing the Lean P90x sequence) and it's already been a week. Last week I started off with a blast but only completed 4 workouts.

1) Core Synergistics
2) Cardio X
3) Shoulders & Arms + Ab Ripper X
4) Yoga X

A few days last week I just didn't have time. I went out to dinner one evening (wed) and was out all day with my best friend on Saturday
Sunday was just a wash as I slept in and didn't have the energy to do any workout.

This week should be different. I did my Core Synergistics last night. It was tougher than the 1st week. I had very little energy but I did do as much as possible and the entire workout played. At this point, I'm going to press on and do as much as possible. I know it's unlikely that I'll be able to do every exercise with their number of repititions. I may not be able to do every day either. I'm going to do the very best I can, given that I started this at 255lbs and a 42" waist.
My goals for my ideal measurements are ~ 200lbs and 36" to 38" waist.