I know there is a way to turn off your RC for a particular book but I can't figure out how to do it.  Is there a way to turn it off a particular book that's on my WL?  Or do I have to wait until it's posted to me, and then is there an option to turn off the RC?  I definitely don't want to turn the RC off for everything, just one book in particular.  Thanks in advance!

There is an option when you are requesting a book from the system, but I haven't seen it on a Wish List offer. The only way to work them it to put that one on Auto-Request - NO and when it gets offered to you, before accepting the offer go in and toggle your RC to NO, (make sure to click the Update button to make it take effect) then go accept the offer. Once you've accepted the offer you can turn your RCs back to YES.

The RC has to be on or off WHEN the request is processed.  So you can either check the box (on the acceptance page) or turn it off before accepting the offer, then go right back to turn it on.  Your WL will need to be on 48 hour offer.