Getting a Tattoo means the Artist has to pierce your skin. That will always involve pain. Irrespective of the size of the tattoo, or even or where it is positioned, you can expect to feel discomfort at the very least though body tattoos are generally less painful than other areas. We all have a different level of pain tolerance, women usually have a higher pain threshold than men, and that pain threshold will dictate how uncomfortable it is regardless of any other factors. The pain is more of a burning or tingling sensation rather than a prolonged discomfort like toothache. In areas which have less tissue, muscle or fat and which are bony, such as feet and wrists, the discomfort may rise to level of real pain. In fact some Tattoo Artists will not work on these areas for just that reason. Unless men have a particularly bony chest that isn't generally a problem. Backs, arms, legs and areas where there is plenty of muscle or a layer of fat will hardly have any discomfort at all.
Finally if it all gets too much and you need to take a break, say so - especially if it is a large tattoo. Your tattoo artist won't mind, they would rather you were comfortable as it makes their job easier. If you need to split it into more than one session , that won't be a problem for most Studios and the nature of a tattoo is such that it doesn't need to be finished all in one go. Body Tattoos are a permanent art form that you have chosen to express your personality - following a few practical steps will make sure it is a relatively pain free experience.