How do you hook up a live wire into two switches?

First turn off the power. You can do it a couple of ways. Take your black hot wire and connect two black pigtail wires of the correct gauge to the wire via a wirenut. Then connect each of the two pigtails to each switch. Another way if the supply wire is long enough you can strip about 1/2 inch off about 4 inches from the end. Make a "U-shaped" bend in the stripped area and put that around one switch and strip the end and connect to the other switch.