By mid first draft, which is where I am now, fear sets in. Is this good enough? Am I good enough? Is there really a story here and has it not been done before? Is it uniquely mine? I spend a lot of time trying to not listen to my fears, but of late, I've been listening, nodding my head the way you might at an uncle who's telling you the same old tiresome story, and then going ahead and keeping at it.
All writers really have, like any of us in life, is the moment. I try to focus on that moment--on creating--rather than fears about whether the book will get published, whether anyone will read it, whether I've failed. In the end, I can't control any of it, but I can dig deeper into the work and tell the story I want and need to tell.