Your adrenelin is going to be so high you will not notice any pain from your nipple being pierced.
Always go AFF! Tandem is for chickens!
My first jump was AFF and all that happened to me was a busted lip from my altimeter smacking me in the face and extreme brusing in my crotch area from the harness not being tight enough.

No sex for a week!
Jumped at 13,500, pulled at 5,500 and my chute was packed wrong and I did a back flip over my chute when it opened. They call it an explosive chute.
I lived, but man was there a lot of blood!
Have fun!
Hugs,
Danielle