Leave exterior walls alone; they have insulation in there that you don’t want to lose. This area didn’t have insulation in it at all… or wiring.
My husband used a utility knife to widen the areas to get a better view, then a jig saw once he knew there weren’t any wires to hit. The utility knife was used by the studs as well.
The back of the dry wall is the back to our bookshelf. He used his nail gun to add them to the stud. The piece of scrap wood underneath is to help make sure each shelf is the same height.
I was uncertain about painting the back of drywall, but I used Behr Premium Plus Multi-Surface Primer & Sealer first. Then I painted everything with a few layers of white paint.
Danielle is a DIY/craft/sewing blogger on DIYDanielle.com. She loves to write about projects that she makes for her small farm, her children, and her home.