You can't predict everything that must be predicted.
You can't plan for every contingency.
You can't reach your destination quickly by taking small steps.
If you want to achieve greatness, if you want to lead, if you want to change the world, sooner or later you have to leap.
The chasm is never as wide nor as deep as you believe. Success is probably closer than you think. Failure will hurt less than you imagine.
Stop worrying. Start doing.