Question for heavy heavy heavily tattooed people

I'd like to be pretty decently tattooed at some point. However I personally can only sit for about 4 hours at a time Max 5.. after that I usually start to get chills, a head ache and feel nauseated..even with a good meal before, snacks and water during. Im not sure if it's the pain or shock.

But anyway..tattoos really hurt, duh lol. I've only had my thigh, and lower outside of my legs done. (Thigh was 2 sessions) And ive heard those spots are supposed to be easy.

I know not everyone hurts in the same areas..I haven't actually had any SPICY spots done yet, like I've heard chest/neck/stirnum are all really bad.

...But the next big tattoo I plan on getting is my Stirnum. But I don't see how I'm gonna be able to sit through it.

...........Basically I'm wondering if dealing with the pain ever gets easier? Not that it will ever hurt less but that you just get use to it.