I have had both ankles, both outer arms and both shoulders/shoulder blades, and all the way around one upper arm almost to the elbow. The worst is a tie between my ankle and the inner biceps. The ankle was a coverup of Kanji and had to be pretty heavily shaded. It took about 2.5 hours, not bad at all, but the table paper after I was done had a Liz-shaped damp spot, lol. I didn't make a peep but clearly suffered!
My inner bicep actually swelled up and was hot to the touch for about 3 days after, making everyone wonder about infection, but it was NOT, just a lymph response and was totally fine. Shoulder blades were no problem, like the upper arm, even collarbone was okay, just a very odd vibration that went through my entire body.
I need my other inner bicep done (feel odd not having this design creep all the way around the arm) but am putting it off because of the other side. Worth it in the end!