Installed two 10' grounding rods driven down through the rock fill. I first tried a sledge hammer from the top of a step ladder but got nowhere fast. I then built a "thumper" out of pipe and a steel weigh. It worked well about an inch at a time! Took a while but went in great. Then ran the grounding wire to the rods.
Insulated the wall where the panel was going, and then covered with a sheet of plywood. I installed the 100 Amp panel and then ran all the lines in the shop (the background to this page is the wiring diagram I submitted to get my permit). I spent the next little while installing insulation, vapour barrier and some of the drywall. Ceiling lights, and fans and all the outlets came next followed by the base board heat.