nipple piercings& my questions LOL HELP

hi ladies, idk how many of you might have this, if you don’t agree just don’t comment idc. but anyways, i’m suppose to get my nipples done tomorrow first off i’m scared as fuck for the pain? anyone have them done what was your experience? second, i’m scared that when i travel it will end up showing up in the metal detector, any ever travel with them? please help a stressing girl out