The silver panels are a right bar steward- they have 4 clips, 1 above and 3 below the vents, plus some smaller tangs along their length. The vents are attached to the panels and come out with them. You will need some plastic trim removal tools- I got mine for a few quid on ebay. You have to carefully prise the panels off- they take much jiggling and force- just take it nice and easy- I would start at the bottom and work up- the bottom of the panels come away much easier, the top round the vents is the most difficult part of the job. The metal clips on the panels have a habit of staying in the console and can be a bugger to get back out- if they fall in the console they're gone forever, unless you are lucky and can reach them through the bottom of the fuse panel cover on the o/s of the tunnel cover at the clutch pedal. The secret, if there is one, is to take as much time and do things as slowly and carefully as required. Once these are out, the stereo is a doddle, just 4 10mm bolts and out it comes- it has a decent length of wiring on it too, to make things easier. The stereo doesn't have a code as standard, so provided no one has set it, you should be fine. The code/recode protocol is in the owner's handbook.
Best of luck....