Vauxhall Corsa 1.2 Twin Port Life - Wet carpets in drivers footwell?

My daughters Corsa is suffering from a water leak which is making the carpet wet in the driver's footwell. The carpet is going to have come out to dry it all out properly. The Haynes manual doesn't go into much detail. To take the carpet out it looks like the only way to get to remove the plastic trim at the bottom of the doors is to remove the plastic trim which goes up the central door posts and which encorporates the seat belt mechanism as this trim overlaps the plastic trim which goes along the bottom of the doors. Can anyone confirm this? Thanks for any feedback.