A.
Hi -
You would be safe to stay away from the mall locations, although I am sure they are safer and cleaner than they're given credit for. I just think that likely most of the girls working in the malls shops are too young to do a professional job.
Many doctors' offices offer hygenic piercing with professional "guns". The group practice where I take my son is Lifetime Medical Associates in the city near United Center. They do offer piercing there - not sure how much they charge. The number is ###-###-####.
Don't sweat being "too old and conservative" if you want to go to a piercing studio. Many of the professional piercers are people well into middle age and they won't judge if you don't judge them. They usually get a kick out of people trying something new. This is truly a great option because (in Chicago anyway) they must be licensed which means they are clean and professional, and have something to lose if they aren't. Wherever you end up make sure the technician is wearing fresh latex gloves, cleans the lobes thoroughly, and be sure you see a fresh needle come from a sterile package.
Hope that helps - good luck.
A.