I started this electronics (Gadget) repair business single-handed in 2011 and developed and expanded with repeat clients and businesses.
The dynamics of this operation has been kept limited to a one-person capacity purely because that's the way I liked it and did not have the desire to expand , however there have been times where potential to grow in to a large entity employing more body and maybe offering technician training was very attrative
There is only 1 training facility that I know of in the country to have a structured training course to train an individual from basic level to a micro-component level in a few days. I myself had to go abroad to be trained.
The most profitable and regular business in a gadget repair industry is a mobile phone repair, especially an iPhone repair.