Hold a piece of plywood against the wallboard at each stud and press the crowbar against it to pry the molding off. If you have two-piece baseboards, remove one piece at a time starting with the base cap and then remove the wider parts.
A wall receptacles with two outlets. These are available rated for 15 and 20 amps, as well as special ground fault circuit interrupters (gfci) and isolated ground receptacles.
After deciding the route, mark and cut the holes for a new receptacle, switch or fixture using the outlet box as a template. Before installing the new box, use the hole to aid in running the new cable.
In a room with old plaster of at least ¾inch thickness, an armored cable or greenfield can usually be run under the baseboard by chiseling a channel along the floor wide enough to bury the metal casing flush with the wall surface. The metal will protect the wires from nail punctures with this method, but care should be used when nailing baseboards to miss the cable.