Tattoos

My advice is to keep your blood sugar up by eating before hand and having something to drink on hand that has a bit of sugar in it to help with the minor shock that your body will go through. Don't do it after drinking or smoking the cheeba as I've done both and they really made it much less fun.

Good advice, but common sense really which some people don't seem to understand (I myself for example would often get pissed after having work done).

Having a tattoo = you are being physically injured, and unlike a fall from your bike giving you road rash, it's happening over a longer period of time.

Take care of yourself, before and after the work and it will be better for your recovery and the tattoo.