I have one. I got it when I was 18. I've mentioned it before, but my twin and I went in together to get it done. She got my middle name on her ankle (Joy) and I got hers on mine (Faith). They look different, but it's funny because it goes with our personalities.
I remember being quite anxious. I wasn't really anxious about the actual tattoo, as we had thought a lot about it first and had printouts of what it would look like before they put it on us. I was anxious on what it would feel like.
She went first. It didn't take long since it's small (maybe 15 minutes?) and she had a different experience than me. She was freaking out because she thought it hurt a lot. I didn't think it was that bad. When it got closer to the bone (which is where it hurts more) it did start to get more uncomfortable and painful, but I just gritted my teeth and looked away. When I know it's coming, I can have a somewhat higher than average pain tolerance.
To me, it felt like someone taking a pen and digging it/dragging it across my skin. I don't remember a whole lot, it was a pretty quick in-and-out experience, but I don't regret it at all. It almost was a bit therapeutic, oddly, though my lack of sleep is making my brain evade coming up with the words on how, exactly.
Hopefully that was at least a tiny bit helpful.