Often I am fine just reading from the computer screen and correcting obvious typos and other egregious errors as I go along, but I occasionally have a tendency to try to do too much editing on the first read-through. I’ll get bogged down in trying to solve problems when I don’t have the full story arc in mind. Which is so counter-productive! So, when that happens, I upload the doc to my Kindle, which keeps me focused because I can’t start tinkering with the text. I do keep notes in a notebook (“Chapter 3: Whaaa? Who are all these people?”) as I go but that distracts me less because I’m not actually in the ms trying to form queries and such.