Someone help me I need to know!

By cartilage I am assuming you mean a helix piercing (the most common kind). When I got mine done it was painless (though I have a fairly high pain tolerance), you are most likely to have done well/in a painless manor if you go to a local piercing shop or tattoo shop and have it done with a needle and not a piercing gun. Know that you won't be able to sleep on the side where you got it pierced for a couple weeks.