Shelf, mirror and picture hanging in Oakville has to respect the walls it goes into. South of the QEW, around Old Oakville and Lakeshore Road, the houses are pre-war with plaster over lath, original trim, and in some cases brick immediately behind the finish.
That calls for a slower approach. I drill small, drill once, and use fixings that spread the load instead of crumbling a hundred-year-old wall. North of the highway in Glen Abbey and River Oaks the framing is standard drywall, and the challenge becomes scale rather than fragility.