I was always a very inquisitive kid, So one day around 14 or 15 I took a pickup apart, and decided that would not be hard to reproduce, My first pickup winder was my mothers sewing machine with a few screws drilled into the flywheel to hold a bobbin. ( I think she never forgave me for that even to her death)
anyway I took a few magnets from some car parts, some fiber board, a roll of wire from my fathers ham radio stuff and wound up a pickup. Wish I still had that POS. It sucked, I knew nothing about polarity, insulation, wire gauge, magnetic fields, or anything. Well I asked my dad and he bought me a book about microphones. By the end of the year I had bought my mother her own bobbin winder. ( Dad made me work all summer mowing yards to pay for the new sewing machine he made me buy her) and learned about polarity, wire, Resistance, Capacitance, and electrical fields, I was winding some killer stuff, but my week point was my magnets, It took me a few years to figure out that you needed to go buy some decent magnets. Once I FIGURED OUT the difference in types and alloys of magnets I could control my results by matching them. I had gotten bad PUs from the music store and learned about potting etc, I through trial and error figured out what makes power, what makes brite, what makes quiet, etc. It is just a hobby now but I really appreciate what goes into a pickup.