Andy,
Pete posted the guide lines for a contest on this DF some time ago. I was amazed at how well it worked for novels.
1. At night, in a dark room w/ only the light on the novel, PhR it.
2. If you notice any sensations or any feelings or just anything at all---stop---back up a page or two if necessary.
Yep, that's all it takes! It blew my mind. Since then i've just done the same thing but w/ a clearly stated goal: I want to find the theme of this book. Next, dark room, light only on the book & for me ( i get the best results from going upside down) i stop when i notice a sensation or just a tired feeling.
At first i actually thought i was tired, but then i realized that that was my personal signal for: stop right now & check it out.
My first book was around 200+ pages. A very simple Nevada Barr book that was laying around the house. Right size, print for a test case.
I went thru it front to back--nothing. Turned it upside down & just stopped b/c i felt tired. I almost didn't bother to look, but thank goodness i did b/c it was at the exact most dramatic spot in the whole book. Someone had just tried to kill her & she was climbing back up the wall of the canyon & had just said to herself that they had tried to make the murder look like a mountain lion had done it. Title of the book: Track of the Cat w/ a mountain lion on the front.
LET me tell you this i was totally stunned. How could i possibly stop on this 1 page w/o any--none--preview of this book. It was a victory but scary b/c i thought: how the hell could i ever get that lucky again w/ a novel?
I stopped 2 more times & had all the main characters of the novel & even the exact page where Anna was discussing to the mother about the girl who was murdered. Honest: 3 stops on the EXACT pages.
I've since replicated this w/ other novels, but i'm not into novels too much. I've read Harry Potter though