Thomas Edison said of genius, “What it boils down to is one percent inspiration and ninety-nine percent perspiration.” That quote can also apply to getting a first book published. For me, developing a storyline and its characters is great fun. But it’s just part of the process.
Editing, illustrating, formatting, designing, developing marketing plans and numerous administrative details can be a long road. (Did I say "editing?") Though less fun than creating a story, these tasks aren’t so small. How well they’re done affects the outcome.