Borrow my 2 yo and leave her alone in the room.
Actually, you just rip off the pattern part (the backing usually stays on). I use a solution I get at the wallpaper store, but I don't know if it's necessary (or environmentally friendly). Anyway, I put the solution in water, and sponge down whatever is left on the walls until it is quite wet, then scrape it off. It's not as bad as it sounds. Then wash the wall down after, especially if you are rewallpapering.
I'll be thinking of you. I have to strip my kitchen!