I started raising the ceiling today I'm going to raise it 12 inches to compensate for the acoustic ceiling I have to install for the fibre optics. Most of the insulation is done (I'll never stop itching)
Grab a pair of nylons (make sure to ask your wife which ones she doesn't mind you using, first, natch) and drop a bar of soap in there then shower using that to scrub your body with-the nylon will get the little pieces of fiberglass out of your skin.
Also, be damn sure you don't wash the clothes you were wearing while putting up the insulation with anything else, especially underwear...shouldn't take much imagination to figure out why.
Got those tips from a guy who installed commercial ovens for a living-there's about 16 inches of fiberglass insulation surrounding those things and it gets put together like a puzzle, involving lots of time standing in one place holding up a big wall of insulation while it gets secured in place.