"Good books don't give up all their secrets at once."
— Stephen King
So be patient while you type away at that WIP. Keep writing--I've told myself and now I'm telling you. It does pay off and when it does--when you've excavated away the filler in your WIP, made the connections, and deduced a mountain of scattered ideas into a story--you feel like the most brilliant detective on Earth. Move over Sherlock!
It is amazing to be not only the asker of the mysteries, but the answerer as well. Our writing and our writing hangups/issues come from us, so essentially we are fixing "us' while we write... I think? I hope?
Good luck with all of your WIP mysteries.