done it before to retrofit my xenons. took me ages but it was the first time i ever had done anything like this and i still managed it.
sayin that i did have use of a ramp in a garage.
these are the instructions i followed with help in brackets at the bits i got stuck at.
1) Remove the bumper:
a) Remove the three bolts holding the top of the grill between the headlights. ( I left these in til the end to make sure it didnt fall off before i wanted it to)
b) Remove all the bolts securing the bottom edge of the bumper to the undertray (about seven or so... just follow the bumper around)
c) On each side of the car, inside each wheelarch:
Remove the three bolts holding the wheelarch liner to the back of the bumper. (The ones along the bumper furthest forward from the bottom up to about a third of the way up)
Peel back the wheelarch liner where the bumper meets the front wing.(Just be brave and pull the liner as far back as you can, found it very tight , could only get a couple of inches just enough to get tools in) Inside, there's a "push in plastic bolt" securing the wing to bumper , with a plastic pin pushed in the middle of it, securing it. Use a small allen key or tiny screwdrive to push out the plastic pin which will allow the plastic bolt to be pushed out.(mine was slightly different. was just a plastic bolt that wedged in, took me ages to figure out at this bit that i just needed to get a pair of pliers and pull it out) If you follow the joint of the wing & bumper around to the front of the car (inside the wheelarch liner), there's another hex bolt that needs to be removed from inside the wheelarch liner, that goes through the metal body work and secures the bumper from behind. ( I got a socket with an extension on it and put it through the small gap til i felt the bolt. its a good bit in the wheelarch almost below the headlight itself.)
That should free up the bumper. The sides are a push fit into securing clips under the front wing, so you next need to spring the sides of the bumper outwards, away from the wing and out of their securing clips. (Make sure you have got all the bolts out at this point and the three on top if you have left them in.)
That should allow you to pull the bumper forward away from the car and rest it on the floor. It will still be connected to the car by the foglight wires, but you can disconnect and remove the bumper altogether if you want to at this stage (By unclipping the foglight wires).
And just do the same in reverse to get it back on.
I managed it and was a total noob to that kind of thing.
hope this helps