I finished my drivers side and reinstalled my Alpine X stuff, put the door panel back on and daaaaaamn, just that one side I can already hear so much of a difference. I ran out of damplifier for the passanger side (I need about 2sq feet to friggin finish it) so I'll end up ordering a little more. But in the mean time, I can start putting that in, I can already tell this is going to be worth it though. I'm glad I went ahead with 2 layers instead of one.
By the way, for future reference for anybody else, I DID end up using all 40sq feet in the two doors of my honda, if you can be a little more conservative, 40 would be perfect.