Not going to lie...It's a major pain in the Butt!!! You have to disconnect the Throttle, Mixture, carb & Cabin heat, fresh air, parking brake, electrical switches......well you get the picture.
The good news is, when your done the airplane will look better than it did new;-)
How much of a pain is it to put in a new lower panel from Bill?
My plastic overlay looks like crap on both sides and a nice new panel might do wonders for the old girl.