i see more guitars than i can count where the owner says "yeah, i set it up myself and it came out pretty good" when it's just hideous, with high nut slots, uneven string heights, intonation nowhere near correct, etc.
after getting it right for them, they're blown away by what an actually set-up guitar plays like.
so sometimes even good players don't know better than the tech how comfortably an instrument can play.
+1 to taking the time to play it in front of the tech, so that he can do final tweaking to fit your style.
^^^What I'da said...