Cue lights can be rigged very simply by someone with basic knowledge of wiring. You need a light socket everywhere you need a cue light, a labeled switch in the booth for each light, enough wiring to connect the two, and, of course, a power source (probably an outlet). One of my cue light switches, right now, is a power strip with an on-off switch that the light is plugged into.
There is an added benefit of cue lights: if you're not using them in a particular production, that power/control can be routed to something else. This show, my "cue light" switches turn the TwinSpin on and off and run the power for the motor of the dsico ball!