I'm allergic to all the non-hypoallergenic earrings and a lot of metal in general (I can't use Head and Shoulders or antiperspirant either!) so if I want to wear cheapy earrings I have to paint them with fingernail polish. Sometimes the polish rubs off without my noticing and it kind of makes my ears immediately infected. When that happens, I tend to use rubbing alcohol to clean my ears and it gets better pretty fast.
I got my first piercings done at a jewelry store then did another three myself, but only kept one of the ones I did myself in the long run because I just didn't own enough earrings at the time to have that many piercings. I don't think I'd have them again for the same reason and it doesn't seem as fashionable as it was in the early 2000s.