Sounds like you have gotten a lot of good advice already. I had know idea about the blunt force of the gun. good to know. I don't want to scare you but be on the look out. My daughters ear became infected about 6 weeks after piercing. I would have thought they would be practically healed. She complained of her ear hurting a little in the morning. Went to the school nurse who could do nothing but send a note home. By the time she got home she had a red streak going down her neck. I took out the earering and all this puss came out. We took her to the ER on a nurses suggestion. She was put on antibiotics.
within the next 6 months she had 2 other septic situations one was from a splinter in her hand. the third we don't know what caused it but she ended up needing emergency surgery to drain the infection. It was in her knee they had to put in a pic line to give her IV antibiotics 3 times a day for 6 weeks. She was on a walker. She is fine now and all the test came back negative for a specific infection. she has had another infection that required antibiotics and it was from something no bigger then a paper cut. She is healthy but when she gets the flu she is very sick for about a week. The dr have run blood test and nothing had shown up. I don't think it had anything to do with her ear being pierced I just think that was the first of many infections. Her other ear was fine. She seems to have grown out of it but I do keep a very close eye on even the most minor of cuts. for my daughter these infections happened almost 3 months apart to the day, so keep your eyes open for future infections.
By the way she had to take her earrings out for surgery and just never put them back. She has "changed her mind" several times about repeircing. Claire has a big rack of really cool looking non pierced earings so she can be in style.
I have one ear pierce 3 times and I actually have one hole that will get infected when the other on the same lob won't strange stuff!
Good luck,
J.