Not completely taken it off but have had the centre and right sections loose. Going from memory......
Unscrew the two covers over the joins between the centre and left/right sections. Under here are 6 screws that hold the side section to the centre section. If taking the whole lot off these should probably be left together as you cannot remove the sections piece by piece because of the sensor loom running from from the centre sections and terminating in the side sections behind the coolers.
Next take off the right grill inside the wheel arch behind the cooler. I took out the arch liner and arch extender but I don't think this is necessary now. Lets you have a good look at the steering mechanism. There's a couple of press fixings that are just under the arch liner edge that could probably be removed with the arch liner in place. You'll then see a multi-plug for the sensor loom and a plug for the right bumper indicator plus a few cable guides. These are all fixed to a skeleton bracket that runs from the chassis to the bumper side. Down the side of the cooler there are 3 screws that hold the right section to the metal "real" bumper plate that runs across the three sections in front of the coolers. With a long enough torx drive you can get to these with the bracket in place.
You can then remove the number plate showing 3 male torx bolts and then behind each joint covers are another 2 torx male bolts and these are the main bolts fixing the bumper backer plates to the "real" bumper. I loosened these and the whole thing looked like it would come off once I had disconnected the connectors and presumably done the same on the other side. This is as far as I took it this go. Base camp.
If you remove the 2*6 screws under the join covers and the three torx bolts, the front section will pull forward and hang on the loom allowing you to get to the bash guard upper fixing bolts. Removing this so that I could spray the bash guard black with Dinitrol inside and out was my first aim - looks way better that silver for a donny grey vehicle. I planned to drop the whole bumper off and then Dintrol the whole lot to death but its been so damp and cold here in Aberdeenshire that the surfaces would not dry off even when inside the garage for a few days. Will leave this until later in the year.
A couple of points - there is a little yellow plastic clip on the join covers want to pop off and fall into the bumper. Gave up fishing and one is still in there somewhere but you don't really need it. Hopefully it will still be there when I fully remove the bumper.
The main torx bolts also tend to drop into the bumper easily and you have to fish them out. The access holes are just big enough to get my hand in but there was a few scary moments when my hand would not come out and my phone was on the bench 7 ft away.
Richard