I've been paddling class IVs in an OC1 here for 30 years. Cadster and the other c boaters that have posted here are on the money. From what you have included in your resume you are light years from running rigor mortis. I suggest you become comfortable on Mish, Numbers the Gorge, Bogan Canyon and upper CC before even thinking about Black Rock and rigor mortis.
Take advantage of paddling with some of the other folks that have extended offers and develop some serious skills before jumping in.