Beaner,
I would suggest you go through the canyon once with a someone else to get a feel for the river. I consider it definately an intermediate float. I went from Morgan's to Oxbow twice with a guide before running it myself. There was a bit of a pucker factor getting into and out of the canyon the first time (everything else is relatively straight forward), but nothing that couldn't be handled (I have been rowing a drift boat for three years).

When it doubt, I usually walk the boat through ... more of a reflection on my conservative approach I'm afraid than a reflection of the boat's ability to take the abuse. Just remember to keep your the rod tips in the boat, your head up, and set-up early.