The best way I found to learn and get comfortable with the feeling was to find a gymnastics gym and go there on their open gym days. If they have a foam pit then you're golden. I learned into a foam pit first just so I could get comfortable with the feeling and make sure I had the mechanics of it down first. Then I graduated to a trampoline, then to a trampoline floor, then a spring floor, then finally to solid ground. Basically I kept moving to things that wouldn't toss me as high in the air and got comfortable on them then moved on from there. After you have the feeling and can do it on solid ground then I would suggest trying to add variations to your flip but only after you have the fundamentals down good (kind of like in martial arts ) I was able to do front flips before I could backflip and the funny thing is, after I learned to backflip, I lost the ability to do my front flips. It took a bunch of practice to get it back but now they're both going well.