I did this once with my 5-6 foot female Boa. Not something I would do regularly, but it was an interesting experience and I knew the risks involved. Something I noticed was that she would keep constricitng if I moved my hand or wrist at all (which actually makes total sense)...I had to remain extremely still until she was finished.
Course that was back when I was able to feed myself as well.....
Chris
"That cute little lizard in the pet shop will, in a few short years, become an enormous, ferocious carnivore; capable of breaking the family cat's neck in a single snap and swallowing it whole." - Daniel Bennett