Let me guess … getting a peacock? I have one down my side.
Like Buttwheat said, going in well rested and fed makes a big difference. And bring snacks to keep your energy up. I bring an airplane blanket and pashmina (large wide scarf), to keep warm or use as pillows.
I bring my IPOD too, but I have never used it during a tattoo, I just kind of zone out. I should stop bringing it.
Good luck.