Electrical wires are intentionally hidden in walls, which is great for the look of a home and terrible for planning DIY projects. There are ways to figure out where there are wires in the wall, however, and you should definitely make use of them before you start drilling holes or making cuts. \
Look for outlets and wall switches. If you're drilling holes or making cuts into a wall that is near an outlet or wall switch, you may be in danger of running into wires. \
Make it a point to drill into the center of studs. Electrical wiring should never be positioned to run down the center of a stud. \