Installing a new circuit to a room above the garage
It is customary to drill holes in the wall and fish wires through the wall using the holes as "stepping stones". If it is an exterior wall, the thin metal strip (fish tape) used to pull the wires through will simply bust up the insulation along the way. Actually this does not hurt the insulating properties very much after the drilled holes are covered over.
Because of the position of studs, usually you only need one hole near the floor and one hole near the ceiling to fish a wire up the wall, but you may need a hole every 32 inches (in alternate stud bays) to reach a long drill bit in and drill holes in the studs to string the cable through horizontally.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.