How bad is a knuckle tattoo pain?

So I'm getting my first tattoo, on my ring finger knuckle next week, and I've heard varying reports on the pain. One guy told me, 'It feels like getting your finger sawed off.' Another said the pain is pretty high, but definitely not that bad. I've never had a tattoo before, so I don't have much frame of reference as far as that is concerned. But I do have a high pain tolerance (had my jaw broken to extract wisdom teeth with faded anaesthesia, felt fine), and I do well with needles (I give platelets with a very thick needle every two weeks, and have piercings). So, how bad is this gonna hurt. I'm 99% sure on getting this tattoo, but I keep getting different answers as to the pain. Some say mild, all the guys who wanna look tough in front of their friends say no pain at all, and then there's the extreme of wanting to pass out form the pain. If you have one, please let me know.