My mom is strict! How do I ask her to get my nose pierced and have her possibly say yes?

I'm a 17-year old senior in highschool. almost all of my friends have some kind of piercing, and i've wanted to get my nose pierced for years! The thing is, my mom has this idea that piercings mean some gang thing if its not on the ears (she was born and raised in Poland..) I think have a nose piercing would be cute, and all of my friends think the same thing. I turn 18 in 4 months but if I'm still living at home, i can't get any tattoos or piercings; and i know i will be living at home for another year or so. I dont want to wait until i move out to get my flippin nose done. I might go get it done on my 18th birthday and just say "EFF IT!" How should i ask/convince her to reconsider?