My first experience with automotive air conditioning repair was 30 years ago in Santa Ana. I was fortunate to get a gentleman in my employ with over 30 years experience. We worked together over 17 years before he retired. He taught me a bunch, I taught him only a few things, we both learned even more. Together we made a knowledgeable team. New car dealerships and other shops would bring difficult AC jobs to us for diagnosis and completion. We have repaired components others replace, saving the customer money.
I've taught my crew how to do it, and they are now skilled automotive air conditioner technicians.