I worked in the garage of a main tractor dealer during summer holidays as a teenager, which I enjoyed a lot and gave me a start in life on all things mechanical.
I was in my early twenties when a neighbour who was a mechanical engineer showed me how to take off and clean the carburettor on my Alfasud, and I them proceeded with carrying-out small maintenance myself e.g. brake pads, spark plugs and oil change, distributor and contact point. This is when I purchased a compression tester, vacuum gauge, strob timing light.
My next car was an Alfa Romeo Alfetta and here I got more heavily involved, doing the head gasket (twice!), prop shaft, rear shocks...
I then met a guy who was studying mechanical engineering and became a close friend for several years to come, he was into serious performance tuning and rebuilt (among others) a mini 1275 GT, Triumph TR7, and Lancia Beta Coupe. Under his inspiration I rebuilt a Mk1 Astra with new engine, gearbox, suspension etc, all done DIY during the 5 years I owned it. I would say that most of what I now know I learnt from him and his mates. They were real nutters...
I then went into the wonderful warm bussom of the company cars world, where you need to know nothing about maintenance because it is someone else's problem (well, not quite, if you follow my post on another thread). This was quickly followed by the ownership of my first and second Omegas during the first 6 years of which the cars were serviced by Vx and I didn't want to know.
Two years ago the Vx dealer told me that the cambelt change interval was reduced from 80k/8y to 40k/4y, I thought they were having a go at me so I asked the question online at the the OTHER forum - and with the help of the fine lads i.e. Laidback, Mark DTM, TheBoy and others got totally hooked... so you might say that I am a born-again DIY mechanic. Yes I probably saved some money but also spent a fortune in tools (some of which i haven't actually even had the chance to use yet..).