So glad this is done. It was a big step to get here. We had to be sure every electrical accessory was installed as well as anything that would be drilled, placed, or replaced in an outside wall because once the insulation is in, it is a pain in the arse to get in to it.
We had insulation blown in the attic and walls. The celloluse insulation is blown into the empty cavities with a little adhesive and moisture. Then, they shave it with a special tool to make it flush with the studs. It dries, or sets, to become a solid mass. Then drywall can be put in place.
It's a real mess. Cellulose is blowing everywhere, but they vacuum up the excess at the same time and shoot it out again. Ingenious.