What parts are you getting to repair your sunroof?
Are you taking the whole mechanism out and replacing it? Because I've found that's the easiest and most common thing to do.
You do indeed have to take your roof lining out, so remove all your grab handles (screws), remove your sun visors (screws), remove your interior light (clipped in), and remove the A/B/C pillar trims (held on with clips so give them a firm tug). Can't remember what else needs to come out.
Once the roof lining is out you'll be able to see the sunroof and how it comes out.. it's all quite straight forward really