I have found that, generally (nearly always) nobody cares about my vehicles (or appliances, or central A/C, bicycles, or plumbing, or electrical, or even my health) as much as I do.
Professionals quite often cut corners in order to enhance their paychecks. I work carefully, precisely, and spend much more time on details than would most professionals. They’d go broke and starve should they be as meticulous as I am when maintaining/repairing my own vehicles and stuff.
Also, I have found that sometimes I know more than the professionals know when it comes to servicing my vehicles and stuff.
My wife has come to learn that I hate to have service performed on anything because I have demonstrated to her that whenever I’ve had service done by other people (because of warranty maintenance/repairs) there is usually some sort of collateral damage discovered (scratches, dents, missing parts and fasteners/hardware, too loose (or not tightened at all!) or too tight fasteners, etcetera).
Another thing is that I can schedule maintenance precisely when it is needed, on my schedule, not somebody else’s schedule. And of course I can do maintenance and repairs at a mere fraction of the cost professionals would charge.
There are exceptions to this (from my experience, very rarely) and I have found one. In the frozen north when I was there for frigid winters, I had occasions where is was just to cold to work outside. A GM mechanic of some 30 plus years, left a dealership and retired. He set up shop at his house out in the sticks near me. He has a newer, well equipped, clean and organized, beautiful shop with several bays and two hoists/lifts. He charges extremely reasonable rates and I can rest assured that he will care for my vehicles practically as much as I do. He is meticulous and (sigh) probably does better work than I do (if that’s possible )
Of course he is extremely popular with people who have discovered him. He’s busy all the time, cars lined up outside, with no advertising other than word-of mouth. The only drawback is that he doesn’t do drop-ins. You schedule your appointment and leave the vehicle for the day, but he’s worth it.
He’s a one-man-act and when you leave your car, you get him, every time, not some rookie helper or a guy who worked at 7-11 two days ago.