Before the beginning of great brilliance, there must be chaos.
~ I Ching

Writer Anne Lamott espouses the idea of "shitty first drafts." Not quite as elegantly put, but the same thing.

Don't try to do it perfectly the first time.

Just do it.

You can refine, perfect, polish later.

Get it out.

Take the first step.

Run with it.

Chaos, then brilliance.