Piece of cake. Couple things to remember. Use heat shrink connectors so there are no issues with corrosion down the road. Use a Marine rated receptical. You may have a ACC switch available on your dash, might want to use it to switch power on and off to the receptical. When you are cutting the hole, put masking tape over the area which will keep the gelcoat from chipping. For the screw holes, bevel the hole surface with a larger drill bit to prevent the screw from fracturing the gelcoat.
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Jvalich
http://www.badcock.com'04 FW 288 Vista "Mental Floss"