First of all, body modifications include: piercings, tattoos, surgical changes to the body, scarifications, brandings, ear shaping, etc... Everything that changes your body from it's 'natural' shape to another one, is basically a body modification.
in this picture I have a 2mm spiral stretcher in my ear
I used to have a labret piercing but took it out because it wasn't centered the way I wanted it to be. Did this hurt? When you get the piercing, the piercer goes through your skin with a needle, I personally think this is not a painful piercing, but that's just my opinion. Would I get it again? Yes! When I move out of my parents house, I will definately get that piercing again, but then centered the right way. I took it out after having it for over a year, so It healed up perfectly, and I never had infections or other problems. I do suggest you watch out when putting in a ring, since your lip will swell up during the night, and it might get too tight on your lip and start making a cut in it. So put in a half ring or just a labret pin what will be much more comfortable.
Future plans: I will get two more piercings this summer, and when I have them, I will write a full article on them. On how much it hurt getting them, how the maintenance is etc. I will some day get tatoos as well, but I dont know when yet, since my parents are really against any body modifications.
Do you have body modifications? Would you want to get some?