Rear outer quarter panel to access the inner side panels?
LR workshop manual definitely worth having as it shows you how to do it. I have the big paper one SRR660ENWM, not cheap but worth its weight! I THINK some of it is on the internet.
Mine was easy & took it off complete with the corner panels that hold the rear lights.
Various nuts & bolts that need to be undone which are easily visible as you look around the panel inside & outside apart from the 2 little studs on a plate that are inside the wheel arch. These will almost certainly shear but are easily makeable.
Open the bottom tailgate & you can see where the corner panels are pop riveted to the body. Drill their heads off.
Check you've got everything & be aware that there is mastic/sealant involved so go carefully.
You don't need to do anything to the rear side glass or the upper corner panels (the ones with the vinyl).
ETA I've just seen Mad Hat Man's post