There's sure to be write-ups on NASIOC. The WRX and XV are Imprezas so not sure what you mean there. A lot of WRX guys see value in "upgrading" their spark plugs and posting about it... but alas the REX, she is a fickle beast. Not to be tampered with by the faint of heart or dense of mind.
One thing is certain, you can guarantee that a spark plug change on any modern vehicle is not easy. And in my experience even the most thorough online write-up doesn't help much.
jake: NASIOC is also your best bet for info on removing the console as the Impreza is likely identical.
But like I've said before, I've gone after online write-ups only to have the process devolve into rippin' and tearin' despite my best efforts. I say, just go for it and be the ones to post the how-to.