It would be very cost prohibitive project. It would involve completely rewireing your home. i would imagine that it could run 10-30,000 depnding on the home and number of locations to be redone.
Run a wire from the light to the switch. At the light connect the black power wire to the black wire to the switch. Not wrap some black electric tape at each end of the white wire going to the switch...
Wall light swtch wiring usually will use #14 wire rated at 15 amps.
All wire on a circuit must be large enough to handle the rated current of the circuit breaker. In other words, if the light is...
Use a volt meter to measure the voltage to neutral on each side of the switch. By turning the switch on and off and monitoring the voltage on one side and then the other, you can determine the supply...