Side vent rings you can just pull out, just pull hard... To re-insert just line up the clips and then push straight back on.
Me and Mike_OBD made a cool discovery getting the middle ones out... We called it "Vent Casting"
Just get 2 strong peices of wire and bend them into a hairpin-ish shape. Use it as a 'hook' to feed the wire round the vent slats. When you get the other end thru, give yourself plenty of wire to pull with good grip. DO THIS ON BOTH SIDES OF THE VENT - Make sure it comes out straight at all costs!
Then pull really really (really!) hard.... The vent will pop out of its socket about 1cm towards you... Now stop pulling! You can then take the ring off and re-plug it in.
You can either do this or un-screw the centre console - easy for those with manual AC, but a bugger for Climate users as 2 torx screws are underneath the climate box which require a wrench-style screwdriver. If you take that lot out along with the cup holder etc, you can push the vents out from the inside...
When your plugging them in - its useful to take apart the glove box as you can just see the side of them. Use a Torx T-20 to undo all the screws.
ILL ALSO RECOMMEND - Masking tape around the vents just incase you slip!