In reply to dunnyg:
The 5+6 guide is excellent, but it doesn't cover the whole forest, so you're going to be at a loss in the trois pignon. I'm not sure if this is true for the 7+8 guide.
I'd go for something cheaper and more general, check out bleau.info and pencil in stuff you want to climb on your topo. Your mate will probably be happy doing blue/red circuit problems at the start.
Bring something to do the forecast is rain fore the weekend.