Wear a respirator and goggles and do it during the coolest period of the year; even so, bring some water with you. Put down as much as you can afford to (as thi

Wear a respirator and goggles and do it during the coolest period of the year; even so, bring some water with you. Put down as much as you can afford to (as thick as possible, but evenly thick). When my contractor did mine, he put in 1-2 feet thick. Also, because I live in Phoenix, we installed some ventilators on the roof to help exhaust hot air in the summer (in addition to the peak eave "vents" at the ends of the house). We wanted to do an exhaust fan, but there wasn't any way to get one into the attic. So far, the ventilators have worked fine.