You might look for folks in your area who own RVs and ask where they get work done. Who knows, you might end up making friends with a retiree with time on his/her hands who will teach you some of the basics!
If you don't come up with a specific recommendation for your area (or even if you do), my approach with a new RV tech/auto mechanic/doctor/plumber/etc. is to start with a small job to evaluate their competence, customer relations, business integrity, and pricing. One characteristic I look for is someone who notices and advises about developing problems and someone who does not oversell unnecessary work. I prefer a smaller shop where you get to know the person doing the work and they get to know you and your equipment.
I was walking into Lowes a while back and my auto mechanic came up to me in the parking lot and said, "Hey, Jon, I was wondering if you are having any more issues with..." (naming a problem I had consulted him about, but no work done, two months earlier).