I had both of mine done, but now only sport a ring on the left nipple. The one on the right boobie started pushing itself out and I didn't want my nipple to rip. When I first got them pierced, I couldn't stop looking at them, but I must say it did hurt...after, not when the needle went through my nipple too much, though. It's a shocking pain, something you don't really expect. After they were pierced, I wore a sports bra to protect them and ensure they didn't catch on anything.
It felt like my nipples were sunburned for about a week and a half. Unpleasant, but easily forgotten about.
I say, do what you wanna do.
I haven't had any problems with mine since. The only thing is it is a slight...I don't know, I wouldn't say burn, just weird tiny sting when it gets SUPER cold. Other than that, doesn't hurt at all. Just be careful it doesn't get tugged.
If you have a significant other, wait for many weeks before you let them get near your nipples with saliva. Saliva=bacteria. Nipple piercings are not great with bacteria.
It looks so hot, though! I will never get rid of mine.
I like my one, even though I used to think it looked funny because now I have one natural, one punk! I also have large aerolas and it makes me feel less insecure.