Turn your head one way and the hips the other way, and EXPLODE. I can do a 180 and right now I'm happy with that much....it takes a lot more energy to commit to a 360. I've gotten lazy and just prefer to huck off of stuff now.
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Practice on flat ground for awhile, then off of a curb, balance beam, or a very short ledge/wall. That way if you catch your bike on it you won't have as far to fall to your impending death. LOL. Good idea, though. Once you have it nailed, then you can do higher stuff with more skill and safety.
Check out this guy's instructional videos on youtube....hands down the best I've seen. He's a trials rider, but most of the tricks he shows will apply directly to any bike. I think his instructionals start on page 4....scroll on through and take a look at all of 'em!
http://www.youtube.com/profile_videos?us...