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Property maintenance probably best describes what I do. I did the sparks training because I come across a fair bit of electrics. It's almost repaid the investment in new work.
I started out doing fancy decorating, stage and special effects. Then got making furniture and painting that, so kitchens and bathrooms followed. Now I also specialise in repairing sash windows.
If possible at your age I would try to focus on becoming an electrician. Which means ignoring all the finishing and focusing on the technical aspects. That's far easier on many levels than my approach. I left it too late to study and now I'm known for what I do. The easiest money I've made is fitting down lighters though.
It's a good choice. It's not such a bad time to start. I did the installation/testing course as well. Just couldn't get into it on my own. I'm happy problem solving and small works.