first off, roll up a newspaper and smack your roommate upside the head.
second, putting that extractor back on can be a pain. i can only imagine trying to get the bolt back out the way it is will be even more painful.
third, find some instructions for putting that bolt back together (applies only if you are unfamiliar with putting it back together, if you already know how like the rest of us, never mind this part). i learned the hard way. that safety's gotta be in the upright position. if not, gonna take at least an extra hand or two.
personally i feel that learning by experience is the way to go. maybe, just maybe, i can screw things up worse than others have.