I believe they are just clipped on but don't go pulling on them yet lol. I think you can find a DIY for this on DA because a lot of the ppl swapped the silver trim of the accord sedan to the wood trim of the CT.
The 3 garnishes attached to the IP are secured by clips and can come off with the correct trim tool (one that is preferably plastic so as not to scratch or damage the parts).
The door liners are a completely different story. You'll need to remove the door liners, disconnect the wire harnesses and then disassemble the backside of the door liner in order to access the backside of the wood trim and then to remove the screws that secure the wood trim piece.
Is all of that really worth it ???? Let us know how your mod goes !