A loooong time ago I worked at Spencer Gifts and a customer came in who said she was going to pierce her own tongue. She never came in after that...hmmm...
I knew a girl who had lots of piercings, all self-done. OTOH, she apparently knew how to do it, and had access to sterile surgical needles and other necessary supplies. People who try body piercings with regular sewing needles deserve what they get (negligent mother circumstance excepted).
I have a sister who's been a nurse in the emergency room. When the idiot comes in with the infected tongue from the piercing, the doctors always give a lecture to the moron about never doing that again after yanking the object out.