I think my first bit of mechanical tinkering was an effort to understand how the kick-back 2-speed gear and coaster brake worked on my German bicycle, aged around 11. It took much longer to put back together than to take to pieces, but curiosity was satisfied! I then surprised myself almost as much as I surprised my dad when, a couple of years later, I repaired the ancient and splendid Suffolk Punch lawnmower he loved - a Woodruff key in the centrifugal clutch mechanism had failed, and I seem to remember having to chase a spark through magneto/coil/condenser as well.
First car was a Hillman Hunter, a 1973 (M) DL model I bought off a small ad in the local paper. It was several different shades of shiny brown (though I think it was nominally "bronze"), had the 1725cc Rootes engine and a 4-speed-plus-overdrive 'box. Surprisingly rapid, although it shook and rattled alarmingly between about 65 and 72mph. I overhauled the carb, which had provided a god-awful flat spot half way through the rev range due to a perforated diaphragm, but did very little else to it mechanically. 10,000 miles in my year of ownership, and I sold it for just over a hundred quid, to go towards my university beer fund, to a guy in a pub who was almost certainly in no fit state to drive it home.
Next up was a Mk1 Golf, which I "shared" with my little sister. By which I mean, obviously, that I spent as much time fixing it as she spent breaking it. It was yellow, and of very questionable reliability, so was inevitably known as the Yellow Peril. A botched head-gasket replacement (misread torque settings - oops) contributed to its habit of belching alarming quantities of blue-grey smoke out the back. It was ignominiously towed away for scrap from outside my front door.
For a few weeks temping between "proper" jobs, my daily driver was a 1930 Austin 7, which I drove to work in Winchester, a glorious drive from the Wallops past Danebury and over Stockbridge Down. 40mph tops, downhill with a following wind, but I did once overtake a tractor, which made my day!
I was car-less for a while as London living made it more of a hassle than a help, then a succession of company cars (small Peugeots, a Polo, a Golf) led to a Citroen Picasso when Sprog #1 arrived. And now, in Canada, the family bus is a Honda Odyssey, my commuting tintop is a Hyundai Accent, but to keep me sane I have the Morgan in the garage (and it's still Morgan weather here - winter is ludicrously late this year, we've barely even got overnight frosts in the forecast this side of Christmas...)
1985 4/4 4str, Jubilee Blue