I’ve come to realise that most good writing (the first draft at least) is a result of yielding control i.e writing freely from your subconscious and allowing whatever’s there to emerge. I feel that when you think too much about writing, your true voice does not come out.
When I was doing NaNoWriMo last year, the best work I produced was during the word sprints. I’d set my timer for 20 or 30 minutes and write for that time. Usually I’d start off with only a very sketchy idea in mind and often this would develop into an interesting dialogue or scene. Sometimes I’d re-read what I’d written and honestly wonder where it had come from. I think it’s a case of trusting the process and knowing that once you start writing, something interesting is sure to come out.