Even when you have doubts, take that step. Take chances. Mistakes are never a failure - they can be turned into wisdom.
FAILURE, MISTAKES ARE NEVER A FAILURE
You can't be afraid of failure and you can't be afraid of success, because either one gets in the way of your work.
My great concern is not whether you have failed, but whether you are content with your failure.
Failure is simply a few errors in judgment, repeated every day.
FAILURE, FEW ERRORS IN JUDGEMENT