The parts of the body close to the bone will generally be more painful when tattooed. That means the hands, feet, ankles, wrists, and elbows. Also over the ribs or the backbone or on the skull can cause a lot of pain. Getting a tattoo on a naturally sensitive part of the body, like the genitals, can also be very uncomfortable.
If you want to minimize the pain, start out by getting your first tattoo on a well-muscled part of your body, like an upper arm, a thigh, or even your buttocks.