Now I know I come from the 1 series community, but we have the same directions for the kidney grill install, and I still dont understand the purpose of removing the rubber seal at the top of the bumper. Its not necessary. Just push down on the grill clips and pull the grill out. Thats how it was on my car, never had to remove any screws or seals.
Just take a flathead screwdriver, press down on the plastic tabs in the clips, pull the grills out. The new ones just snap right in.