How long it took?
Once I had removed the gear stick trim which was easy, I then started to pull off the aircon/controls trim and i started at the bottom but after pulling it away from the bottom two clips, the silver trim kept pulling away from the little cubby hole below the card holder and I was worried that the vertical silver narrow parts would just break, so I pushed the trim back in again and then went to the top and removed the silver lid below the radio (hidden compartment)and that was easy. I just used a knife covered with a soft dry cloth and gently levered it from either side of the centre.
Once I had done this, I was then able to remove the aircon controls trim starting at the top (the location of the clips are clearly marked in the link provided) and I again used a covered flat eating knife to gently lever off each side and worked my way down to the cubby hole below the card holder and this time, I had no problems.
If you look at the link from the German forum (page 5), you can clearly see where the clips are and what order to remove the trim.
Start by removing the silver lid below the radio, then remove the gear stick trim and pull it up (but not off) over the gear stick and lay it to one side. Then start removing the aircon controls trim from the top and, as stated, I used a flat bladed eating knife covered with a soft thin cloth. Insert the knife at each point and gently prise the trim out on top, each side and then move down to the middle and finally to the bottom and you can then pull away the trim but don't remove the cable that's attached to the bottom half of it - there is no need to.
It took about 20 minutes Tato.
I hope this helps when you get around to fitting you switch.