There are a ton more tutorials on the web.
Find a big, soft mat, like a high jumping landing mat to practice. Even better would be going to a gymnastics place during the open gym, you might even get help from a coach.
- JUMP STRAIGHT UP
- use your arms on the jump
- wait to tuck until the top of the jump
- tuck tightly
Explosive ab work will help the tuck, like hanging knee raises. The biggest obstacle is getting over the fear. Once you do that, its smooth sailing.