Things You Will Need
It's the same size as a standard toggle light switch and is designed to be wired the same way. The advantage is ease of use; the wide, flat rocker switch is easier to find in the dark than a toggle, and all you have to do is press it (as opposed to flipping it up or down).
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Turn off the power to the existing switch at the fuse box.
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Remove the plate cover by taking out the screws at the top and bottom. Unscrew the toggle switch by taking out the two mounting screws. Pull it out from the wall. It should be connected to two black wires looped around two receiving screws on the side of the switch. Disconnect the wires by unscrewing the receiving screws and slipping the wires off them.
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Hold your new rocker switch in front of the electrical box, making certain that the indicator arrow on the unit is pointing up, so you don't have it upside down. Slip the two black wires around the two receiving screws on the sides as it was wired before. Tighten them both, and wrap a piece of electrician's tape around the side of the switch to cover the connections.
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Press the switch into the box and secure it there with the provided mounting screws, putting them through the receiving holes on the electrical box as the previous switch was wired. Cover the switch with the new plate that fits it, and secure it with the provided screws. Turn the power back on.