All one piece, get one of the wing like pieces loose by warming with a hair drier the lift that end up, the clips will pop as you go and some will need refitting and aligning. Once you get to the other side apply heat again to release the other wing. Once removed you will see a line of holes with white plastic inserts ( some of the clips may remain in these and will need pulling out to refit on the trim. The clips on the trip should be pink and are springy so fit between 2 tracks on the trim, once fitted you can slide these clips to align with the fixing holes before pushing them in.