It's funny because you know the novel process: you get the drafts, you get the galley, and then you get the galley proofs. You have opportunities to change things all along. But the further along in the process you go, the more careful you have to be in making those changes, and the smaller the changes have to be.
The worst thing that can happen for a writer is for a writer to start believing their own press. I think the industry, and the comics industry in particular, is littered with the bodies of writers who believed their own press. And you can see the moment they did, and then the work nosedives.