This trick is not very difficult at all. Its actually its quite simple, and a lot of people think you should be good at them on a tramp before you try this. Thats crap, i cant even do a frontflip on a tramp and i can do backflips. The key is to try in deep powder, that way youy dont get hurt. 

       First off all, the faster the better. Even if its your first time trying, go as fast a you can, then after you try it and you dont like the trick, try it next year or something. Then, as your approaching the jump, bend with your knees as much as possible, so you can get height. Spinning really fast wont do the trick, you must have height. After your at the top of the jump, extend with your knees as much as possible and lien back, as far as possible. Its almost like  trying to throw you body and head at the tail of you board. If you spin correctly you'll spin so fast you don't know how you spinning in the air, you just spin and land. Everyone had their own style off backflips so down worry if your don't look like mine. As you come around try to stay centered because you dont have time to set up for the landing, you get land. It helps a lot if you stay centered through the whole trick that way your chances of landing as much greater. Absorb the landing with your feet and ride away clean. Good Luck!

Pic will be up soon!