Petrified of needles and blood but want a tattoo?

Ive been wanting a tattoo now for about 5 years but have always avoided having one because of my fear of needles and blood.Ive been with other people when theyve had them done and it hasnt bothered me to watch but im afraid that Ill sit down, theyll get halfway through, ill p out and theyll have to stop and ill be left with half a tattoo.Im planning on getting it on my right wrist, 3 small coloured erflies, does it hurt more on the wrist than anywhere else? and could you possibly describe what it feels like?.I understand that everyones pain threshold is different but If I can get a general idea of how it feels it may prepare me a bit more for whats to come, thanks :)