I think it's important to remember that writers do not have a monopoly of wisdom on their books. They can be wrong about their own books, they can often learn about their own books

Ugh, writer's block. The best thing to do is to forget about everything you're trying to do. Get away from your writing station, kick your feet up and relax. Then allow your mind to just wander. Don't stop it. Just let yourself think of anything, no mater how silly the thoughts seem. Remember, not to judge these thoughts. This will open up your creative receptors. You'll begin to think outside the box. Then the good stuff will start racing through you. That's when you start writing!