dmunky: The only way you can mess up the hole in the earpads is if you cut into the curved part of the earpad around the edges. Just make sure to stick to the flat part of the earpad (sorry, hard to describe without a pic). And I just used a decent pair of scissors, didn't even need a socket.
Also I found that it helps to expand the outermost ring of openings in the grille cover, you can drill three extra holes through each opening to make them bigger. I'd post a pic, but no digital camera
