Nowhere to go but out, nowhere to fall but off, nothing to do but keep on or quit

I was never any good at telling a story or even a joke out loud. Thought I was better with writing, but this manuscript is a mess. I've spent two weeks rethinking, adding to and taking away, and still have half of the thing staring me in the face. And always at the back of my mind gallops the rest of the story to be added on before the end. Then I'll have to rewrite that! Mother of Pearl!