nipple piercing

Hey girls. 
I'm 17, 18 in March next year, anyway I really want my nipples pierced. I have wanted them done for ages but obviously I cant because i'm underage. 
What the pain like getting them done from 1-10. 
10 being the worst. 
Also, my boobs aren't very big so would they suit me. I'm a B cup. 
Thankyou xxx