Do you mean three switches side by side? If you can't imagine what this looks like under the plate--it's just three regular switches side by side, nothing special--I'd recommend an electrician do this for you. As for what you replace it with, do you have preferred protocols and are you already using some sort of hub/software? You have a few Z-Wave recommendations above that will require a hub (not a bad idea) and a couple for Lutron (the truly "smart" ones of which, like Caséta, will also need Lutron's Smart Bridge).