I'm reading C.S. Lewis' The Screwtape Letters. Well, listening to the CDs in my car. If you don't know it, the gimmick is these are letters written by a senior demon, Screwtape, to his junior nephew, Wormwood, giving advice about how to corrupt the soul of one man in 1940's England.
At one point, Screwtape acknowledges the risks they face now that their man has become a Christian. So Screwtape advises his nephew to keep the man thinking about God, but don't let him turn it into action. As long as he's just thinking about it, then there's no real harm done.
So that's my take-away: often I get caught up in the thinking (or in the iterative search for perfection of the thinking), and not in the doing. As James says, faith without works is dead. Don't wait until I'm worthy or 'good enough', just step out in faith and be useable by God. My job is to act, and leave the results to Him.