One of the
"rules" of writing that I have the most trouble with is, you need to give yourself permission to write badly. A first draft is a just first draft, and does not have to be perfect. This is why I've been stalled for close to a month on my WIP. I second-guess myself, or else I spend my writing time flipping to Wikipedia or Google, trying to figure out how long the Holland Tunnel is, or when chain-link fencing first came into use, or other minor factoids that aren't so important that I have to break my stride. Bad writer.
Now, I jut need to remember this, and put it into practice.