It was uncomfortable, but didn't hurt. It wasn't as big as Johnny originally planned, but still looks great. It was done in under an hour and I now know that if and when I move, I won't hesitate to get another one on the other shoulder!
For now though, this one will be enough. Right now it's covered in vaseline and clingfilm (I feel like a chicken about to go into the oven) and I can't take a bath or go to the sauna for two weeks, but I like it.