FYI: I just did the whole thing from under the car without taking off anything other than the bottom plastic shield, the 4 bolts for the wires, and the 4 spark plugs. I used 2 knuckles and a shot extension. It took about 2 hours after subtracting breaks and trips to the store (for the knuckles).
It would have been easier with multiple different length extensions and a flatter ratchet head (I had to back out bolts/sparks not so far that they prevented removing the ratchet, and the finish by hand... er by two index fingers and friction I mean). Not fun, but not all that horrible either, and you don't need to bother taking apart the engine bay. I had the front up on jacks, but if you have the ground clearance of an Outback (like my XT) then you should be able to do it on the wheels.