How do you pierce your own nose without dumbing it?

I assume you mean 'numbing' it? You shouldn't be piercing yourself, get it done professionally. You need to have a very high grade of surgical steel or titanium jewellery as well as needles, and when they do it in a shop they also have a receiving tube to help prevent you from nicking your septum when the needle goes through. Going to a professional will also help ensure that the piercing is straight and pierced in an appropriate spot.

And I'm not going to get started on the risk of infection... StudiOS use ten thousand dollar pieces of equipment to ensure that everything they are using is clean and sterile - not something you likely have kicking around at home.