What can I do to overcome my fear of doing a back handspring?

By pushing with your shoulders when your in the middle of the backhandspring. If you push with your elbows you could break an arm.

And you need to sit in the air like your sitting in a chair.

Do not bend your knees at the beginning.

If you do bend your knees a little, make sure that they are not covering your toes.

For warm ups, you can push your arms back and ask someone to press on them.

Before you do a backhandspring, make sure you have stretched out your wrists and ankles.

I DO HAVE A BACKHANDSPRING. PLEASE DO NOT ATTEMPT A BACKHANDSPRING WITHOUT PROFESSIONAL HELP!!!