Gary, you can pry the gaskets off with a screwdriver.
You should not need to remove the rocker boxes, only the covers.
Remove the 4 bolts for each cover and remove cover. Clean oil off of cover and mating surface. Remove old gaskets, inner and perimeter, use a q-tip to clean groove the gaskets sit in.
Install new gaskets, reinstall covers, tighten 4 bolts evenly and torque to proper specs, do not over-tighten as you can warp the cover.