TV mounting: forget the stud finder you saw on YouTube
On block or concrete, the job is straightforward: a hammer drill with a 6 or 8 millimetre masonry bit, nylon plugs matched to the screw, and the bracket pulls up rock solid. Expect 45-60 minutes for a fixed or tilting mount up to 65 inches, including unboxing, levelling and cable tidy-up. On gypsum, the calculus changes. A fixed mount for a mid-size TV can go onto heavy-duty toggle anchors spread across the plate, but a full-motion articulating arm concentrates leverage onto a few fixing points, and on gypsum that demands hitting at least two metal studs or, better, fitting a plywood backing board first. A technician who proposes screwing a swing arm straight into plasterboard with plastic plugs is telling you they have not done this long.
Good workmanship shows in the details you can check yourself: the TV sits level (put a spirit-level app on the top edge), cables run through a trunking channel or in-wall conduit rather than dangling, the mount's locking screws are fitted so the panel cannot be lifted off by a curious child, and the technician does a firm downward pull on the bracket before hanging the screen. Budget 60-90 minutes if cable concealment or a soundbar is involved.