Det,
Think of a relay as a draw-bridge if you will for power to the lights. The switch that you bought from radio shack just opens and closes the drawer bridge for the power to the lights. I am not trying to insult your intelligence with this post , only trying to help with the analogy. I believe if you can understand the purpose of each component you can do the install yourself and save the money. The hardest part is running all the wires.
Rich
'03 White Lux
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\'03 White Lux
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