Just do it, whatever it is
quit withining! quit hesitating!
quit preparing!
Don't focus on the goal of pefection, just focus on the work you can do today.
Keep moving forward
movement forward is progress.
you can't unlearn an experience.
Keep track of what you do
keep a journal
try logging both your failures and success for a week also.
Remember:
Perspective matters
Failure teaches
Success follows
So Don't wait until you're ready.