My LBS installed my new handlebar slightly off-center (by about 2 or 3mm). It looks simple enough for me to loosen the 4 stem bolts just enough to scoot the bar into its proper place, and then re-tighten the bolts. But before I put my completely non-mechanical hand to it, is there anything I know about applying the right amount of torque, the amount of grip the stem exerts on the bar, etc?

The way I see it, if I just reverse the precise number of turns I made to loosen each bolt, I can't really go wrong.... Or maybe a 2-3mm offset doesn't even merit bothering with?