The blower vents just pop out with some levering from a screwdriver or similar. Be careful not to mark the surrounding plastic though.
You can take most of the dash trim off just by unclipping the smaller trim bits and unscrewing the larger bits.
If a piece won't unclip, it's probably screwed on, look for the screws and undo them, keep pulling at it until it comes off or you can tell where the other screws are.
