There will always be some doubt. That is the nature of any creative undertaking, the overall idea or goal to be achieved might be, usually is, known, but the route to getting to that point is fraught with possibilities and decisions. This is especially true when fashioning a story, book or script. I suppose, like for many a would-be scribe, I start writing a story entirely for myself. There is no thought of what a future audience might make of it.