With a gun, it doesnt usually hurt, but it also depends on your tolerance for pain.
Can I make a suggestion? Get your cartilage pierced at a piercing/tattoo parlor. They will use a hollow needle, rather than a gun. The piercing guns like what are used in the mall are not sterilized, and that is one step in the wrong direction when it comes to piercings. Also, they could increase scarring if they get the gun stuck on the jewelry after piercing.
A hollow needle is a lot more sterile, and reduces your risk of infection
