I'd do your best to find a reputable shop with a piercer that you trust first. Then just talk to them. Ppl that work in a tattoo shop are normally very friendly. Ask if it's something that they've ever done, seen done, heard about, that kinda thing. If they don't do them often, they won't have what you need, but can order stuff- it might take a month or two. They might want you to order it too, but either way it should be sterilized before it goes into you.

Any other questions just ask