The grill comes off easily enough; lever up the center of the plastic clips with a screwdriver, remove the inner and outer sections of the clips, then remove the grill. It may take some encouragement, mine needed a good slap from behind (oh, matron). Just a heads up, these clips cost £25 for 10 from Honda!
Clips: There are four more at the bottom of the grill. Old photo before cleaning!
These two plastic pins come through the grill and are secured with some metal locking-washer thingys. I just levered the washers up, got frustrated, then snapped the pins off.
Back of badge:
Back of grill:
I then levered the badge off with a chisel. The adhesive is not overly strong, but the grill plastic is fairly soft, so be careful not to dent/scratch it.
Front of grill, badge removed. It's covered in masking tape, not very helpful I know, but better than nothing and I'm not taking the tape off until it's been lacquered.
Interesting fact: EP3s whistle at 55mph if you drive without the grill. Discovered this on the way to work today, thought it was something really awful happening at first.
I've been doing this now because I had to remove the bumper to fix a headlight, so I'm combining a few jobs - Paint grill, new badge, mesh splitter vent, replace fogs with vents and CAF. It's really not hard to take the bumper off, and it makes removing the grill dead easy. As Dazzawest said, the lower clips will be hard to reach on the car.