Rear door inner panel removal.

[mrpj]

That nice new car I posted a picture of recently now has a dent in one of the rear door skins! Some (censored) has obviously hit it with something in my absence.
I want to gain access to the door inside to see what could be involved and need to remove the trim panel (electric window so no crank handle).
I can only find reference to the Mk 2 Yaris online and this site.
Does anyone have instructions to remove or can confirm the following?
I suspect there is one screw under a small plastic cover disc behind the inside door handle. Would I be correct in that there are more hidden screws to be revealed when the window switch panel and it's power plug is removed? I would then guess it's just held on by push fit trim clips around the panel edges. Pull away, lift slightly off the window frame and disconnect the two cables from the door handle and locking lever?
Probably very similar to the Mk 2 method which I have done before.