The insulation that we blew into the attic was cellulose, which is basically shredded up paper. The depth was marked on the trusses with flagging tape, trouble lights were strung so as to provide some visibility and then Deirdre, the smallest and likely most flexible of us, climbed up there and went to work. This is what our cozy attic looks like now that it has been insulated. 
We were aiming for R50 and I think we succeeded!
