I'm with you 100%. Unfortunately my trepidation manifests itself in the form of false bravado. We've had lots of lousy meals because I thought I knew what I was doing, but didn't.
However, in the grand scheme of things I've learned a lot through bad cooks. Mostly, I've learned to relax. Light the grill, throw the food on, close the lid, drink your beer. It's a simple game, really. We'll see how it turns out. As Crash Davis says, "Don't think, you can only hurt the ball club."
Or, get on WKC and let the guys around here do the thinking for you!