What do you have to study to become a professional body piercer?

you mostly have to study the human body and where all the vein are in the body so you dont hit them

Also, try to attend classes for the control of pathogens/disease prevention. TO be certified, you have to take CPR/ basic first aid classes and take a bloodborne pathogen class. I'll post the link for the APP website so that you can see what exactly you need to do to become certified.