I've been working on Dragonborn: The Beginning for nearly two years now. It's had several false starts, mostly because I simply wasn't ready to begin working on it. Yet, I'm nearly 90K into the story now--the end is in sight--and I discover I've got some major errors to fix. Damn it.
I know these errors can be fixed and the story will be fine. It's just annoying. And it makes me want to run screaming in the opposite direction!