If I were you, I'd charge at least $35 an hour. I had a Roto Rooter type outfit come to snake my pipes out. They spend about 30 minutes and charged me $120 bucks. The only equipment they owned was a truck and a rooter machine. The combined IQ of the pair who did the work was around 100 and their social skills were nada. You are offering a service based on your experience, intellect and investment in your gear. If you're good, $35 an hour will seem like a deal to most people.
The name of the game is service. If you strive for excellence and can deliver high quality, there is no reason not to charge a fair rate. To me, $35 an hour is not high if the quality is first rate.
A short story--I know two guitarists who teach. One makes $14 a lesson in a guitar store and he's incredible. The other makes $50 an hour going to your home. He's OK. What he does offer is respect to his students, rapport with parents and an image. He wears a suit and tie and drives a Mercedes. Moral? Its how you market yourself and who you market yourself to.