How can I add insulation to my attic cheaply and safely?
We just usually bring up a couple of 2x8s at about 10' a piece and use as walkways.   You can't really do much with blown in insulation other than add more to it.  Cost of 2x8s (you can get the "bad" ones from big box for $5) and insulation + renting a machine (most are free given you buy X amount of insulation) is about a $400-600 job for most mid sized houses.