A system and leveling device for installing an electrical box or ring on a wall stud, and a process for installation using the same. The leveling device has a generally planar elongated substrate having a horizontal bubble level on a front face and positioning pins on a rear face. The positioning pins are configured for insertion into gang screw holes on the electrical box or ring. The system includes cross-stud braces for spanning the distance between adjacent wall studs. The electrical box or ring has pass-through slots to receive the cross-stud braces so that the electrical box or ring can be leveled using the leveling device prior to attaching the cross-stud braces to the wall studs.