Focus on the electroncis in cars. There's masses of it in cars now. Every car has at least one computer. Some have 6! Then there's the stereo, the nav gear, the communications gear, sat stuff, security gear, instrumentation, seat controls, phones and screens.

There has been a lag in training of specialists to look after the electronics in cars and the average mechanic is not coping although they are getting better at it.

A specialist shop that deals with repairing and installing electronics should do well.

One outfit I know made a fortune repairing engine managment computers for many models of cars. They did this by exchanging, repairing the incoming module and then stocking it as the future exchange module for the next repair coming in.

The hair cutting and the automotive thing are a hugely different contrast. One will suit you.