Labor is fairly trivial. You basically need a ladder, a drill, and a caulk gun. Final hookups can be done by any licensed electrician for $50. It’s a LOT harder to install, say, a solar water heater than PV.
You do need a permit. In the unincorporated county, permits are free, in most cities, permits are under $300. Drawing up plans and obtaining the permit is probably the hardest part, because you also have to coordinate with the utility company:
