Yes, you will need to remove the wheel. You will also need to carefully remove the connector down on the column using a small tool to release the turn signal wires from the connector. I cut the old wires down near the connector on the column, leaving some wire, so I can remove one old wire at a time, and make sure I put the same color new wire back in the same spot. You also will have to pull out the old switch, and wire from the top after cutting the old connector off. Then feed the new wires down the column, and then put the new wires one at a time in the old connector. Also, on removing the horn, if it's the deluxe wheel, like a Fury, or Sport Fury, there's screws on the back of the wheel to remove it. And disconnect the battery first.
I think there's a service manual on line for this year car. Do a search on this site.