Did this a few years ago but here's how I recall it. A bundle of the cellulose gets about 30 square feet. So figure with loss one bundle will give you a 5' by 5' square (thats with 2 by 4 studs in your walls). You need the two hole method, first filling from the bottom, so you will have and idea when the cavity is filled of close to it. Also as your filling from the bottom cover the top hole so the cellulose does not blow out as your putting it in from the bottom. You want to fill every cavity you can get at, around window and doors.
I'm not sure if you plan on doing this from the inside of the structure or the exterior wall. My installation was on the inside walls and went with 2" holes, cutting them out with a rotozip. To plaster afterwards I stuffed newspaper in the hole to give me backing for the plaster repair.
Best of luck with the project, rredogg