DirecTV's definition of standard install: 1st floor where basement ceiling is exposed rafter. Custom, billable is routing cable within the enclosed cavity of a wall. I install custom jobs daily, and have been the Devil's Advocate many times because CSR's don't explain the install practice, because they have never been in the field with a tech to understand what is involved in the install..........Cross training would be a great thought.............
. On the upside is if you do the fish yourself and are at least adequate with it your install will be 100% better than the D* installers because its your house and you want to protect your investment so you will be extra careful.