A couple of things I'd watch out for if going to a new piercer:
1. Has the piercer completed a
Skin Penetration Guidelines course? I'm not sure about outside of Australia, but here the guidelines vary from state to state, but cover the same grounds.
2. Does the establishment autoclave their re-usable instruments, and are all instruments presented to you sealed or brand new? Make sure they open them in front of you. If you take your own jewellery they'll need at least an hour to autoclave it prior to piercing (and it'll cost you about ten bucks) and they have the right to refuse to use it if it's nicked or not up to standard.
3. Make sure they know what they're talking about. If they say anything you think is possibly dodgy, run for the hills! If you don't feel right, get out of there. If they make you feel stupid at any point, leave. You shouldn't be made to feel silly for asking questions.
4. Listen to aftercare instructions, but use your noggin. Anything alcohol based will disrupt your cells healing. What has worked best for me is soaking the new piercing in warm water with sea salts (kind of awkward to hold a cup over your boob, but bear with it) and castile soap with a little lavender oil can help too. Don't confuse healing (the white-ish crusties) with infection (yellow pus, hot to touch, insanely sore, general feling of unwell/fever)
I have a nice little horror story of my own

I sat down to get my tragus pierced in a little corner cosmetics shop who shared their piercing space with excess stock. I sat down on the big scary dentist chair, and the piercer goes "Hang on darl, theres a spot of blood there", proceeded to wipe the dried blood up and dispose of the wipe, placing his gloved hand in the bio-hazard bin. He went to proceed to pierce me, and by then I should've been miles away, screaming and waving my hands in the air like a raving lunatic. Learn from my mistake, if you're not comfortable, get outta there!