Many people never get started on their creative projects because they're petrified that it's going to be wrong.  They know they are not artists (!), and so they procrastinate until they truly are not.

But here's the secret: go ahead and write at the top of the page ABORTIVE ATTEMPT.  Go ahead and tell yourself that what you're about to produce is going to be crap—and that's OK! You can fix it later.

By telling yourself that it's OK to create poorly written/drawn/composed dreck, you actually start writing/drawing/composing.  You temporarily disarm the Critic Inside Your Head by saying, "Look, no need to freak out about how bad it's going to be.  I am doing it badly on purpose, OK?"

And then you get it done.