I don't know what make guitar you're looking to work on -- but sometimes you can contact the guitar maker and ask if there is certified guitar tech in your area. For example, I go to a Martin Certified guitar tech in NYC whenever I need work done on my Martin CS-00-21.
Also, good guitar shops in your area usually have qualified techs they work with and can recommend.
Finally, I'm sure that there are a few Philly based guitarists on this forum who'll chime in with suggestions.
If you find one who comes highly recommended, I don't think there's any reason to try out a "test guitar" before the real one.
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