360 flips took me about a year or so, with a few tips from friends. Once I learned them they have become my go to trick over gaps and stuff, just because they are a bit odd. Its all about putting your front foot slightly off to the side of the board at a slight angle (your feet should almost form an "L") make it so your back foot is on the tail so that if you were barefoot you could rap your toes around the tail. Another thing that helps is to put your feet a little closer together than normal for that extra leverage. Then just flick the shit out of it, like Sanch said, with BOTH feet, making sure to whip that back one around, focusing mostly on the shove it aspect of the flip. If your feet are proper the flip will just happen. When you jump for it, really suck your feet up, its gotta spin for a second in the air before you land back on it. Also, at first for me I would kind of fly in front of the board, so don't leap ahead of the board, flick it in front of you. Trying them fakie or on a bank back to fakie is a bit easier at first. The key to this one is in the weird foot position and the fact that you use the back foot a lot more than in most flip tricks. Just keep practicing, try to get the board to flip faster and tighter, just flick 'em and whip 'em around a bunch and you'll get the motion. at first doing it off a bump helped because it gives you extra time in the air and the way your weight transfers works well with them. Hopefully this helps, we all got our achilles heel, mine are frontside flips. But if it makes you feel any better I tried backside smiths for about ten years before I just recently learned them. And because I worked so hard at it it felt that much better.
only off benches and loading docks when i was 12, now i cant tre flip, i wish i could but i know i cant, some shit just dosent work. id say it took me a month or more of trying (off a bench) it before i could do it. hardflips, frontside flips and tre flips dont like me.
A shocking revelation! didn't you nollie 360 flip into a back tail or something? and fakie tre back nosegrind? Thats weird. Guy just said in his transworld interview that he can only do 'em switch.
And yeah, frontside flips and hardflips don't like me either, I think their just haters though, so I wouldn't worry so much.