I'm reaching the point in the current work-in-progress where I'm tempted to go back and start over again from an entirely different point in the story. I've already radically altered the planned ending. But I think it would be a big mistake to start over now. I think I've got something good going, and I would hate to ruin it because I second-guessed myself. Better to finish what I have and then change anything that needs to be changed in editing.