I just did this tonight to fix a busted light...not SO bad...it took about an hour to get the bumper cover off...harder to put back on than to take off...I was scared to break anything trying to snap it back into place...
I just bought my Edge yesterday (2007 SEL) and can say that the AC was blowing very softly at full blast/barely (if at all) cooled the car (I got them to drop the price $2k for the "AC" issue). I replaced the cabin air filter today and it is working great now.