If you want your belly button pierced you have to make sure that you go to the right person. You have to know first the background or have information about the person who will do the piercing to you. Make it sure that s/he is professional and all the materials that s/he will be using are clean and safe. I have a friend who has done piercing, she saw an ad in the mall with a promo of free piercing. After doing such,she got infected and now she learned her lesson but I guess it was too late.
I just wanna say, why you wanna have it its so painful and its also has many restriction after you have it.
So i suggest you if possible don't hurt your skin without any reason.