It's supposed to be pretty easy, as far as removing the waterfall. I'm trying to find all the tutorials from ScionLife.com because I know I've seen a few on there. I'm about to do my '13 xD trim in CF. (Whenever it shows up in the mail.)
This is the pieces on the steering wheel:
http://www.scionlife.com/forums/showthread.php?t=220941
Here's one to show the waterfall removal:
http://www.scionlife.com/forums/showthread.php?t=161864
Someone quickly explaining the vent removal for the waterfall:
http://www.scionlife.com/forums/showthread.php?t=201397
This is a full walkthrough, but its on a TC:
http://www.scionlife.com/forums/showthread.php?t=212369
but I'd imagine the door trim and stuff will be the same. I think the bottom trim part, where the cup-holders are is held in with 1 screw in the back cup holder and clipped in the front. (I was yanking on it one day when I was tucking some wires and it popped up pretty easily, freaked me out though. lol)
Edit: Post pictures! I wanna see how it turns out!