I am trying to replace the switch for my porch lights with a digital timer, but now I'm not sure how to wire it in. My current switch has four wires going to it. One of them is obviously the ground, but the other three wires are all black. One of the black wires is on a brass screw on the side of the switch, and the other two black wires go into the "stab in" connectors on the back of the switch. As far as I can tell, this switch operates three outside light fixtures, and it is the only switch that turns on those lights. The timer has a green ground (no problem), a black "line," a white "neutral," and a blue "load" connection. Do I even have a neutral line to my current switch? Are all three legs "hot?" I'm just a dumb opera singer and would appreciate help from someone who knows more about this than I do. Many thanks in advance.