Taking the grill out was easy enough but parting the chrome surround was a bit fiddly. Very easy to brake the tabs that hold it to the grill. I broke one. Only painted the chrome bit, wish I'd done the grill now!
The cupra slitter needed cutting both ends, tad too long for where I wanted it to sit. There is also two long supports in the middle of the splitter that need cutting down by, I think about 25mm. Pre-drilled the splitter, car up on ramps and fixed it with self tapping screws, starting one side of the middle. Then the other side. This is because that's the only part that lines up, the rest of it had to be pulled about to follow the shape of the underside of the bumper. Once I was happy I then screwed in the rest of the self tappings. Pre drilled thru the holes in the splitter into the bumper with small drill bit. I tried a practice hole to make sure I'd got the right size bit for the screws.
Then took it back off the car and painted it. Looks loads better the same colour as the car.