Trust me i'm no mechanic. My car is on an 08 plate with a flat back badge. There really is no mechanical stuff at all. Just remove the 2 screws holding the plastic tray to the boot. Then remove the 3 bolts holding the washer motor in place and move it slightly out the way carefully. Then unclip the wires from the boot handle and undo the 3 torx screws holding the handle in place.Then it just pops out.
With the blunt side of a knife i just worked around the edge of the badge and poped it off the boot handle. It's attatched to the boot handle with small clips.
You can then spray or do what ever design you want to the handle or badge. Im just waiting for the paint to dry on my badge now so I can fix it back on. I will post up a proper 'how to' in the guides section of forum when i'm done.
Hope this helps
This is my badge just after spraying. I went to Halfrauds and bought some black perlecant paint to match the car