As I said mate once the chrome pops off it's just the same with the black plastic trim, loosen the gaiter get your hands inside and around the black trim and just gently pry it off, its around 8 clips holding it in, two top and same for sides and bottom, just ease it off bit by bit.
I'll had mine off earlier this week and it literally takes a few minutes, If your still struggling I'll try do a video and post it for you to see