Agree with above -> Pro-fit Ski shop in Leesburg and Alpine Ski shop in Fairfax are my go to shops for boot fitting and ski tuning related services.
For boot fitting, Brian Eardley at Alpine Ski Shop in Fairfax is very well respected. He was recommended by Rusty C. (former Epic Ski moderator). He was my boot fitter. Only problem is, he works at the shop during ski seasons only. I suggest you call the shop to find out his working hours. There are 2 Alpine Ski Shops. one in Fairfax, one in Sterling. Brian works at Fairfax shop.
For skis tuning, mounting, I know Brian Eardley does not do that (I asked him once). Techs at Alpine Ski Shops do those and I don't know the quality of their work as I never had my skis serviced at that shop.
I bring my skis to Pro-fit ski in Leesburg for tuning and waxing. Agree with
@Coach13 said about the quality of their work. Brian Deeley, owner of Pro-Fit ski, is another very well respected boot fitter in this area. Since he owns the shop, he is there all the time, no need to call / make appt. you can just stop by.
I had bad experiences with REI and Sun & Ski, almost ruined my ski trips.
I live in Alexandria, VA. Pro-fit ski in Leesburg is about 1 hr 15 min. drive one way. But I find the long drive justified, I only bring my skis to Brian D.'s shop now, it is reliable, no bad surprises. They also have an inside ski deck. I go there once a month for lessons during off season. It is good way to continue working on my techniques.