I work on my car all the time. In fact I rarely take it into a garage and I am completely rebuilding my 1974 Jeep CJ5 from the bottom up. All at my home without a lift. Also Tesla does it with all their vehicles also so to say it can’t or isn’t done is just not dealing with reality.
the Repairsmith was just to show that it is being done. They are not the only ones out there and I am sure if you google mobile auto repair in your area you will find people doing it in your are area also.
Andy