It's pretty easy to fit, fitted one on my LC a couple years ago and it's still on there despite it being scrapped and bumped lol. You have to trim down the 2 centre pillar things as there too tall to fit on to the bumper without it bending the front down, trim small bits off first and keep offering it up then once it all sits flat then All I did was line it up so had equal gaps where it hangs out into the wheelarch taped it on to make sure it looked right then put 2 screws with 2p size washers on it for the 2 centre fixings which go through the centre of the 2 pillars you've just trimmed down then I found that the splitter had plastic that I could secure using screws but make sure you get it even all the way round so one side doesn't poke out further then the other side then once it's all fixed on get a junior hacksaw and trim off the excess parts in the wheel arch area and that's job done. ;-)
Can't remember if I had to trim anything else off it but when you offer it up you'll see which bits will need to trimmed.