Large right trim piece = ...de-install right side vent, pull down leg room cover, rip out air duct...get a magnetic torx driver (small and large) --> max 30mins to de-install

Putting the new trim piece back in, is a whole different story...a story of patience, blood, sweat and tears....naw...not THAT BAD, but you need good tactile senses.
Took me an hour to install 4 of 7 screws, starting from right to left.
Will probably take another hour to do the rest...yes, it did...PATIENCE is the key word

DONE!