Here is a great powerpoint on how to blow in cellulose into a wall. There is a real trick to doing this. Your generic blower rented from Home Depot does not have the power needed to dense pack to 3.5 pounds per cubic foot. But there are ways to work around this.

Check out the Dense Pack Cellulose Installation File.

We are insulating an entire house in Brooklyn right now and the tutorial was helpful to us, and we consider ourselves seasoned cellulose installers of Brooklyn brownstones. One of the main things is understanding how to use the blower to blow through the cracks in the house so that the cellulose dust fills them. You achieve this with a hole, among other things.