Hi! I have both of my wrist tattooed and I have veins that pop up. I didn't have any trouble with pain for them. I even have one that's shaded and colored. Again, pain is different for everyone! I would not trust numbing cream or things like that because it could have a bad reaction to the ink. If it's your first tattoo, I would recommend starting off on something a bit more meatier if you're scared. Like your upper arm. The thing is, they won't go where your wrist bends, they'll go a bit above.
Ah okay that’s good!! Also I’ll probably just stick with lines, I’ve kind of got my heart set on having it on my wrist and I don’t want to fuck my skin up by colouring just in case 😆