I got hooked when I did a "shutterbug" week at Girl Scout camp at about age 12 - that was the first time I developed film and saw a print show up in the developer. I took photography for my art classes in 9th grade and 12th, then for my art requirement freshman year of college ('86-'87). Nothing until about '98 when I started taking darkroom classes at the Danforth Museum School in Framingham, MA. Once I built my own darkroom in '03, I didn't take any more classes except one continuing ed one at RISD in '07. I think I had enough different instructors that I took little pieces from each. I've definitely learned a ton from shooting with other APUGgers and seeing what's posted here and at sites like LFPF and some others.
Having my own darkroom and being armed with the basics is what really let me learn the most, I think. I could work on my own and get results which taught me how to get better ones. I'm still learning...