best way to get blocked as a writer is to start second-guessing yourself, and the best way to do that is to pause and think too much about what you’re writing. Everyone has an overly-developed internal critic, and if you give that critic a quiet moment to speak, he will crap all over whatever you’re writing. Don’t let him. Bulldoze forward. Vomit those words onto that keyboard. Get the story out of you, because once it’s out, you can manipulate, tweak, and make it better. If