Hi, i was worried about this before i got mine done aswell!! I have had mine done for quite a few months now, and of course there is always a risk, but there is with any piercing.. as long as you go to a good place & look after it, clean it and the like then it should be fine :-)
if you want it done just go for it, the more you think about it the more you'll worry.
It didn't hurt having it done, but it was sore for a few days after, so be prepared not to be able to talk or eat properly. i couldn't eat properly for about 5 days.
make sure to clean it properly aswell, all i used was some mouth wash twice a day (make sure its not got any alcohol in it, and its not a strong one), and then with some warm salt water after everything i had minus water - just put a teaspoon of salt in a cup then add some warm water and swish it round in your mouth for a bit!
good luck! xx