Removing the headlining is the first job to tackle. The plastic covers on the front, middle, and back pillars need to be removed. The front just pull and pop off. The middle ones have to have the seat belt holder guide removed before you can unscrew the single screw and pop it off. The rear pillar is similar, the seat belt guide holder has to be removed, then the 4 screws holding it on before poping it off. You also need to remove the sun visors, and grab handles inside. Popping off the grab handle covers is awkward at first. With a thin screwdriver you can ease them off. The plastic covers on the seat belt guide bolt is best removed pushing up and out from the bottom of the cover.
At the back, the headlining is held with two plastic bungs to the roof. just pull them out. Of course the interior light has to be dropped out too. Plus the sunroof motor.
BUY A FRIGGIN HAYNES (or at least check the Bravo-guide)