they use a piercing gun or a needle
No
A Needle.
yes you can use a 15 gauge to pierce your nose i did. and it hurt a lil bit but yes you can
It is not a must, But it is a good idea to use a needle that is slightly bigger than the jewelery you are using to allow for swelling and to also allow air flow so that your fresh piercing heals faster. ergo if you are using a 14 gauge piece of jewelery you should use a 12 or 13 gauge needle.
yes.
They would use a needle. Have you ever seen "The Parent Trap" (the one with Lindsay Lohan)? In it, to trick the parents into thinking that one daughter was the other, one of the twins had to get her ears pierced by her sister. What her sister did was strew a needle through her ear. In order to steady the needle, an apple or other soft fruit would be placed behind the ear to catch the needle.
A 16 gauge or 14 gauge are the most common for lip piercings.
I wouldn't recommend it. 22 gauge is smaller than 18. The smaller the number, the larger the ring/needle. If you use an 18 gauge needle and then put a threaded 18 gauge ring in, you are likely to have more pain. I would use a 16 gauge needle and then put the 18 gauge ring. The threads won't tear the new flesh, and you're less likely to chicken out because it hurts. Remember to push the needle through with the jewelry, because if you take the needle out, you'll lose the hole before the jewelry goes through. But then again, you really ought to go to a professional.
25
use a needle ice cubes and achocol
No, order a sterilized 14 gauge hollow piercing needle, a set of forceps, and a sterilized jewelry and you're all set. You can get all of that for about 10 bucks from Painful Pleasures