Using a sewing needle, safety pin or piercing gun to pierce your belly button is a bad idea, as these items are unsafe and will not produce good results.
Furthermore, what size needle do you pierce a belly button with?
Professional belly piercings are performed in a standard 14g (gauge width) and pierced to fit the standard size 10mm (3/8)and 11mm (7/16) belly rings.
In this way, is it dangerous to pierce your own belly button?
You should NEVER try to pierce your own belly button or any other part of your body! The risk of infection is very high if the right equipment isn’t used and if it’s not properly sterilized. The danger of an allergic reaction, bleeding, and scarring is also very real.