The ignition switch lock is not hard to replace. The switch first needs to be exposed by removing the colomn area covering it. Older cars use a clip or a pin that can be pressed, that will allow the switch module to slide out. Many newer cars use a clip and a pin to slide the switch out. Many times you will need to rotate the key to a certain position for the switch to slide out. The older switches use mechanical connections to transfer the voltage from the battery to the starter and the ignition coil. Newer ignition switches use a electronic switch called a proximity sensor. The prox. sensor sees an internal metal tab and will switch the 12 volts on. The switch allows the car engine to spin over, start, then stay running.