Remove grab handles and sunvisors
Be very careful removing windscreen pillar, B, C and D pillar trims - B pillar has plastic hooks which break off for fun, C & D pillars have plastic lugs which push into metal clips which also snap off.
There are 4 screws which hold the lining in place around the sunroof aperture
At the back end there are push-in clips holding it in place - you need to prise these apart to drop the headlining down slightly, there are a further 2 locating clips which slot into the crossmember in the roofnear the C pillar
IIRC thats all the screws and clips - the rest is glued in place under the sunroof trim and under the door seals in the door apertures.
If you're replacing the sunroof lining as well it is held in place by 2 x rivets which need to be drilled out - so you will need a pop-riveter with very small rivets to refit it.
This is not a particularly difficult job - but its fiddly, long-winded and easy to break stuff. Take your time
