Most homes have only two exterior outlets—one in the front and one in the back. That may be OK most of the year, but it’s a real hassle when you’re hanging holiday lights. It can be dangerous, too. Overloading cords or outlets poses a fire hazard, while crisscrossing your driveway and sidewalk with cords creates tripping hazards. In just a few hours, you can solve these problems forever by adding an outlet or two. Do it safely and easily with this simple through-the-wall technique.