Buy switch and receptacle boxes that meet local codes and are large enough for the wires they hold. It's easy to underestimate, so buy extra supplies. At the same time you install boxes, attach fans, lights, or other fixtures that need to be hardwired.
Local codes specify where cable should run and at what height to place receptacles and switch boxes. Check codes before you begin.
About 1 hour to install eight boxes
Hammer, tape measure, drill, screwdriver
Measuring, driving nails
Expose framing, remove obstructions in the room, make and follow a written plan that plots the location of each box.
New-work electrical boxes, 1-1/4-inch wood screws (not drywall screws)