I just got my nipples pierced two weeks ago! It was no big deal. A quick slightly sharp pinch and it was done. A little throbbing and ache afterwards, but nothing more than you get with a good clamping. And you get something long-term out of the pain as well. *smiles* new toys!
I had been thinking about it for a long time. Now that it is done, I think the anticipation of how much it was going to hurt was much greater than the reality for me. And of course you have the adrenaline and endorhpins to help you through.
One helpful is to wear a tight t-shirt or sports bra for the first few days afterwards. The added pressure on the nipples is soothing and minimizes the ache a bit.
They are fun too.. soooo sensitive now! *giggles*