The cigar lighter is installed from the back of the center trim panel.
To remove the center trim panel, open the ash tray and pull out on each lower corner. It will be hard the 1st time you remove the spring clips. Once the lower part is released, work your way up to the top, there are 3 spring clips on each side of the center trim panel. ( circled in black in the picture below )
When you get to the top, be careful how far out you pull, the Passenger airbag deactivation light is at the top, with 2 small wires to it. ( circled in green )

Once you have the center panel released, you can remove the HVAC connector ( clamp over type connectors ) or work on it in the truck.
Remove the cigar lighter connector, and release the locking tabs on the cigar lighter body. Pull the lighter plug through the front of the panel.