Sweet. Slot canyons are a thing of beauty.
Helmets wouldn't be a bad idea!
The shutdown last fall interfered with my being able to buy plane tickets ahead of time, so canceled my trip that included doing 5 canyons with a small group, but I can't wait to do Orderville top-down(maybe Birch Hollow with it), and either get with another group or do a couple of easy canyons solo.
For canyoneering stuff, check out Bogley.com's forums if you aren't already a member there.