Just wanted to open with: I wouldn't really sweat the differences in product lines with a hair dresser. When I was relaxed, I would occasionally bring products with me and I never had a stylist flatly refuse to use them on me. I have had a couple that balked a bit and then tried to sell me on the benefits of the products they use in their salon, but bottom line is that you're a paying customer so, in the end, they'll use the stuff you bring in if you request it.
With that out of the way, I have to say that I am EXTREMELY nervous about salons and I have not been to one since I stopped relaxing my hair about 2 years ago. I'm more concerned with technique (getting a bad cut, bad dye job, etc). I don't want to have to transition out of the damage that someone else does to my hair--lol I can do bad all by myself.