Yikes, some of these stories make me hurt.
I would totally recommend though for anyone having a young kid done or anyone who is afraid, to have both sides done at the same time. I know when I did my youngest ones, she was 5 or 6 and we got one side done and almost couldn't get the other side done because she was freaking out so bad. My friend had to hold her and we were both crying so bad and swore we'd never do it to anyone every again. I've seen that happen too, when the kid is so wigged that the parents have to come back in a few weeks to do the second one.