I can't speak for ALL stores, but the Discount Tire place in NW San Antonio is exceptionally good. They're very careful with all alloy wheels and if they happen to nick an edge, they'll get it touched up at no cost. I had similar luck with a Discount Tire in Round Rock. Best thing to do is talk to the store manager/lead tire tech and make sure they have the right equipment and that their techs are properly trained - or insure that their best guy works on your wheels/tires.
2013 F30 335i M-Sport 8AT/MPE/MPPK, 2011 128i M-sport Cabrio 6MT/PE