lol, it's totally at the artists discretion, some will do it, some won't. if they feel you're very serious about it i'm sure it's no problem. but yeah, it's not very plesaant. i went in for a 5 hr session on my ribs, (outline) and back the very next day for another session, to get started on the color.
NEVER do this, lol
LOL I hear you there. I've never been in so much pain, and I've had back surgery to remove part of my spine LOL - OP don't worry its not that bad Lmao!!