It's just a matter of determination and not being afraid.
One day, a few years ago, I was with my friends and one of them decided they wanted to learn how to back-flip. At first I thought it wasn't gonna work.
We watched a 13 minute or so video on YouTube, two or three times. Then we walked to a park nearby where we did some practice runs, and within 15 minutes, my friend was back-flipping by himself. Basically he started out on the ground, practicing throwing his hands back above his head, then bringing them down and his knees up. Then standing up, he would do the same thing. Then he would do the same, while one person on each side flipped him. Slowly we had to put less effort in flipping him, and he would put more effort in flipping. Then when he was finally ready, he did it, by himself, on the first try.
I told another friend who wanted to learn how to back flip what had happened. We watched the video, and he skipped through a lot of it, did not take nearly as much time practicing, and when we went to flip him on the first try, he fell on his neck.
You gotta be determined and patient,..