Working out and stuff

[Inbred Chocobo]

So yeah, I got ahold of that P90X workout system, and have decided after a while its time I changed my diet from fast food and soda to something a lot more healthy. I don't think a simple minor tweaks here and there are going to be enough for me to stick, so I'm going to try radical changes and see what happens. I'm not really here for diet and nutrition facts, nor exercise tips, its why I have a hold of that system, but I do have a few questions for you NPF.

For you peeps out there, I am curious about a couple things. One, has anyone else every tried that P90X system? I've heard its rough, but I've talked to a few people that have done it... and wow, they really do show some crazy muscles. Two, I've got enough stuff in my life to motivate me to stick with this plan, what I think my troubles are going to be are resisting temptations like sodas and desserts and fast food, does anyone got any tips for that? Or how about this, how many 20oz bottles of coke can someone drink in a week and get away with when trying to do some working out? I figured less it better but knowing my antics, I'm still going to want one or two.