As a further example, some late model cars require removal of the front bumper and wheel well liners to replace a head light bulb (just the bulb, not the assembly). Thus a job that should  ideally take the average owner with a screwdriver a couple of minutes then takes more than an hour  by a person with the necessary tools and know-how of how to properly remove all the various fasteners and clips.  Worse, this is not a roadside repair that the owner can do when in need (e.g., noticing that a headlight bulb has burnt out on a road trip.)