If you're wanting the area numbed then you don't know enough about piercing to do it yourself no matter how steady your hand is or how sterile your equipment is (lol@double entendre). There is a reason that any good piercing studio won't numb you for piercings and that is that it causes the healing process to become lengthier and therefore more open to having an accident of some sort interfering with the entire thing. If you're numbed when you get stabbed your body won't be making the appropriate responses until later and then it'll have to work out what's happened and all sorts.