I have done it a couple times. It isnt hard at all.
-Take the seat out of the truck.
-Unbolt the tracks
-Unclip the cover from the seat frame
-Pull the cover off the cushion.
-Cut the 20% section off the frame and cushion.
-Put the cover back on and fold extra around the edge and use the seat track to clamp it down.
Or you can go to the JY and snag a cover and cushion from a passenger seat and put it onto your driver side frame.
I have done it both ways and using the pass side cover and cushion looks super clean (just like factory.)
I also grabbed the cover for the back of the seat so I would have a hole from the arm rest bolt.
-Take the seat out of the truck.
-Unbolt the tracks
-Unclip the cover from the seat frame
-Pull the cover off the cushion.
-Cut the 20% section off the frame and cushion.
-Put the cover back on and fold extra around the edge and use the seat track to clamp it down.
Or you can go to the JY and snag a cover and cushion from a passenger seat and put it onto your driver side frame.
I have done it both ways and using the pass side cover and cushion looks super clean (just like factory.)

I also grabbed the cover for the back of the seat so I would have a hole from the arm rest bolt.