I used to be a qualified electrician, plumber, and registered gas installer, until i had a nervous breakdown (still recovering). Unfortunately i also have severe arthritus in my knee's and hips which prevent me from returning to the building trades, so i thought long and hard about what to do next and, as i can fix things (a logical mind) i decided that a clock / watch maker was the obvious choice, i can still use my BRAIN ? and hands to fix things but i can do it sitting down.
Malc