I have a 1920's house with the "blown-in" insulation that was done sometime in the 80's. The stuff is pretty nasty. It irritates the crap outta me when I'm in the crawl spaces or attic. Tonight it's bugging me 'cause I just opened up another wall and the stuff has been falling down from above inside the wall constantly as I work inside the new opening. I just blew massive nasty black crap outta my nose... I've seen the new spray in insulation, and I'm wondering if it's something I can do myself. I still have/want to insulate the ceiling joists in my attic, and I want to re-insulate my crawl spaces. Anyone have any experience with it? Is it expensive? I can't find any do-it yourself info on the web, just services.