The great thing with computers is they let you make mistakes, and let you pick yourself up and do it again. Musical instruments are the same, so long as you aren't worried about people listening in.

A favourite quote of mine - and I know I've cited it here before, but then, that is what "favourite" means - is Chesterton's "If a thing is worth doing, it's worth doing badly".

Backing out from doing things because you don't think you're good enough looks like humility, but seen in one way, it's really closer to vanity.