I'm not sure how much more stuff is in the back between the late and early gen 4s but mine was pretty simple. you just have to though it out. You'll probably get some minor arm pinching but with some sweat you'll get them out. Just reach back there with the socket and extension, make sure you got it on the spark plug and then attach your ratch and break it lose.
A good test to see if you'll be able to do the job (cuz some people have bigger hands and arms) is to reach for the back plugs from the sides of the car..and if you CAN pull off the plug wire from the plug...then doing the other stuff should be easy...I did it like Shark8513 did his...I pulled the wire off...put the spark plug socket on the plug...put the extension on the socket...then attached the wrench to the extension....I found it hard to get the wrench, extension, and socket on the plug in one piece.