I changed the the spark plugs on my 08 Fusion today. in order to get to the back 3 plugs you need to loosend all the bots on the intake as well as take off the bolts to the EGR (ima assuming thats what that is) and disconnect the 2 hoses and plus on the intake. You wont be able to completely take it off, but will have enough room to work. I vaccumed around the top part before taking everything off so make sure no trash got down the sparkplug shaft.
It took me less than an hour to complete it. Anyone else should be quicker.
BTW: I purchased the plugs on summit.com for 4 bucks each (reg price was 21.95 ea)
I used Bosch Plat +4
