Good for you but also know women that have lost sensation from augmentation too. I had them pierced by a reputable piercer. I didn't say I lost all feeling just some and it pisses me off still but also the chance you take with any piercing. When people ask me if they should do it, I will always say no.
Don't get them pierced until you get back from TTR. You need to give them a good 8-10 weeks to heal completely. Most often you'd be fine in 4-5 weeks or so...........but I wouldn't chance it in the pool water at TTR. Start of no larger thsn a 14ga and a reputable piercer and YOU WILL NOT LOSE SENSITIVITY! Ask around......................with very very few exceptions you'll find that to be FACT!
Had my augmentation on Dec 17 and really wish my nipples were a little less sensitive. They feel electric!