been bit by my dragon several times. Most times she never broke the skin and the bite felt sort of like a pinch by somebody with nails long enough to mark the skin. It wasn't as painful as say, a kitten in a playfull mode but my dragon at the time was around 6 months old.
The times she did bite hard enough to draw blood, one was just where she got me, on the top of my finger instead of the side where (at least on my hands anyway) the skin is much thinner and soft. The first time she drew blood was when I was trying to pick her up after chasing her around my living room trying to catch her to put her back into her cage. She didn't like to be handled much back then. I thought she wouldn't bite and just bluff...but she decided to skip that part and chomped on my finger. It hurt but not really that bad compared to bites from other critters I had.
The other time she bit me was while I was hand feeding her crickets and she missed the cricket, caught my finger instead. She didn't mean that and looked very apologetic about the whole thing. Of course I forgave her and fed her more crickets and she was more careful after that. She was about 8 months at this point.