I suppose the skills needed for rotating tires, changing oil, stuff like that, folks w/those skills are easily found. If I can do it, anybody can 
But for the electronics and computer issues of modern cars, and basic diagnosis of the cause of a stubborn problem, someone with those skills I expect could command a good deal of att’n from the employers.
Aren’t folks in the auto repair line of work thinking their first job is a learning experience, watching how the business is run; then , when they learn how it is done, and have developed specialized skills not easily replaced, wouldn’t they start looking to open a shop of their own? It doesn’t have to be one giant leap. A person could become an expert at body and chassis re-alignment after crashes, gain the confidence of the insurance agents, then open their own body and chassis shop. After that, add transmission work, and when that’s successful then move on to a full-service shop.