Pete's got it, remove the vents first and you'll be able to access the head unit... What I find a lot easier, is to also remove the centre trim with the ash tray, heater controls, etc... With that taken out, you're a lot less likely to drop the bolts down the back of the dash, which without magnetised sockets is very, very easy to do with this model... When fitting the new unit in, make sure you've got the air vents attatched to the head unit and slide it in as one... This will ensure the air vent panel will fit correctly and not keep popping back out all the time...