So yesterday I stepped back and edited the first ten thousand words. That was easy - my writing partner had already critiqued it. I just needed to make the changes she suggested.
Today, I have more difficult work before me. I need to read the remaining ten thousand words and figure out the exact moment where I took a wrong turn. Ten thousand words is a lot to edit in one day, so I'm just going to work on a chapter at a time and take as long as I need.
Maybe it would good for me to make it a practice to write ten thousand words and then edit those words before moving on. I think this will work well for me if I have a detailed outline and am certain of the ending. My hope is incremental editing will make final revisions easier in the end. We'll see.