Bumping in case anyone else is thinking of this.

I recently got one and am in the process of organising my next (which is 2 big pieces). The guy who does mine uses new needles each time (he doesn't believe that sterilisers should be used, as they can fail), each needle is disposed of immediately after use as is the tube and grip, he uses the highest quality Nitrile gloves opposed to standard Latex gloves and medical underpads are also used to protect you from surfaces on which you may be resting the tattoo area. As well as medical grade soaps.

So, as long as you go to somewhere mega clean like I go, you won't get an infection at the shop. You'll get an infection by not keeping it clean or by picking it.