I would also be careful when removing the door cards mate, I did mine and forgot about the screws that sit behind the door speakers. When you remove the speakers you can see them. They screw through the plastic of the door card into the metal of the door itself. I managed to break them on a couple of the doorcards, before realising why they were not exactly co-operating when being removed. Which is a bit annoying really and pretty daft of me. Ah well.
Also regarding the b-pillar covers, they're a tad awkward as they dont exactly just pull straight off. There is a small clip in the middle of them that you can't see straightaway when looking at the cover (and is pretty flimsy), so I would recommend pulling the rubber door seals away on either side of the centre pillar first as they hold the cover in place on either side for the most part (make sure you have prised the front and back door bottom sill covers up slightly as well at this point, as pulling the rubber door seals away at the base of the door frame can put pressure on the plastic of these too and could crack them).
There are also two prongs that keep the B-pillar cover in position at its base. After pulling the door seals away you should now be able to remove the b-pillar cover from its central clip, it slides out of the clip backwards I believe. Overall I'd say try not to use too much force to remove the B pillar covers themselves, as its a f**king pain in the **** if you break any of the clips haha.
Also, I'm not sure if its been mentioned but there are two screws holding the door opening handle section in place on the rear doors (1 is behind the ashtray when pulled out) and 1 in the front door opening handle section (behind the small plastic oval shaped plug on both front and back) as well as the bolts and alan key screws in the pull handle section.
Hope this helps mate! Bit longwinded but I could of done with this info before cocking up numerous times ha.
The seats are a doddle really btw.