1952 Ferguson tractor when I was 6, and not heavy enough to depress the clutch and brake simultaneously.
First road-vehicle shifting practice, while still under-age, was one mile in a 1959 Rambler Classic 3-on-tree (which made the same clanking noises as Ford manuals).
First extensive practice in the 1954 Chevy One-Fifty below, while my parents still owned it.
First proper 4-speed (besides the Ferguson and my parents' 3+granny F-100), the Subaru below.
First 5-speed, the Mazda below.
Two very different 2×4=8 speeds, a 1968 IH 444 tractor, and a circa 1980 Plymouth (Mitsubishi) Colt.