Pretty much anything on the inside of the arm sucks, all the way from the armpit to the wrist, with the inner elbow being the worst. Of course that's been my experience. Different people have different pain tolerance in different places.
For instance, I got a couple tats on my chest (not a full chest piece), I damn near slept through both on them because I felt almost nothing, except when the lead to the machine zapped my nipple lol. But I've seen other people get inked in the same spots that just about crawled out of their skin.
I think pain is an interesting thing and mostly mental. I can sit through a 12 hour tattoo (the samurai girl was about 11.5hr... but probably because we screwed around a lot), but I pass out when getting pierced, lol.
The only names you should ever get tattooed are blood relatives... I know a lot of "high end" shops won't tattoo names at all unless its a child, sibling, parent or grandparent.
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