I do set-ups for guys 'round the doors' from me and the one thing I suggest you don't do with a 'shop front' that claims to offer this service is simply leave the bass with whoever is serving and ask for a set-up.
Bear in mind some shops will have one person setting-up their own instruments which will be mostly 6-string guitars and their man may make the mistake of treating a bass the same as a guitar i.e. only bigger and having less strings (obviously those here who play basses with more than 4 should ignore that bit). It is, as we know, a competely different animal.
From my perspective I need to know how the guy plays - plec, finger-style, slap, tap, whatever, how hard he plays and where on the bass he usually has his right hand (apologies to lefties) as all of these factors dictate the sort of action appropriate to an individual set-up. It should be tailored to the player as much as the instrument. It's therefore a good idea to master your own setting-up if you can and then you will presumably be content with the result.