I used this guide for my mid-2012 model (because I thought it was a 2010). It was very similar. The Torx screws were a T7 instead of a T6 and the subwoofer connects with the airport card (instead of the airport card being inside the clutch). I suspect there is a more specific guide on this site. :)
I was replacing a clutch cover that had cracked into a few pieces. I found the replacement didn’t slide to the left on installation. On further investigation I found the tabs from the old one were broken off inside where the cover slides. Once they were removed the install wen much better.
I found my replacement cover on Amazon.ca in case someone needs a Canadian source.