Getting a leg-sleeve, work?

Heya Guys, Soon i will be getting my first tattoo, a rather large, full leg (just above knee) sleeve piece, and i was wondering if i have the piece on the saturday, if i will be able to stand for 5 hours on the following tuesday night. I need to go to work, and i really cant get out of doing the shift. I have heard horror stories of swelling and such, is there anything i can do to avoid this, or at least make the 5 hours as easy as possible?