Excellent stuff!
Mechanics was something I started by putting pushbikes together from scrounged up bits in the 1950s. Mid 60s it was keeping ageing motorbikes on the road and by the late 60s it was cars.
Not many jobs I didn't tackle back then. Parts shops were plentiful and the vehicles relatively simple. Haynes Manuals and Autobooks were your friends...
I recall measuring rusty MOT failure brake pipes with a bit of string, going up to a local garage and getting a straight pipe made to length, then bending it to suit and fitting it. Cylinder seals, brake shoes and eventually brake pads and discs.. all familiar. Brushes for Dynamos and Alternators, water pumps, failed hoses, etc. Spark plus, points, leads and coils.. Even replaced a fuel tank on a Polo because the car was worth it. Same with front sub frame for a Fiat Uno. (Yes! really!)
Valve clearances were a regular 're-setting' job. I never figured out exactly how you were supposed to set the clearances on a rearward sloping Simca 1100 with engine running without spilling oil everywhere.. but managed it sort of...
Fiat 127 'Special' had a leaky head and corroded the mating surfaces, so a skim at a specialists followed by a kitchen table rebuild including a lot of polishing and porting. Worked well.
Polo threw a cam belt and bent five valves, so I pulled it to bits and fixed it..adding new valve seals for luck..
Several years later, same car died due to failed oil pump on Cat and Fiddle pass, so got a motor off a low mileage VW Derby write off and spent three weekends freezing my nuts off on the drive in January to swap engines. Stuck a new clutch in while doing that and got a few more years...
Now..at 74, I can't be arsed so much as taking a wheel off.. but for some reason only trust myself to change the oil and filter.
My mileage is low these days and it would doubtless be much cheaper just to get taxis and use my bus pass, but I don't want to stop driving just yet.