just did it its not too bad but its kinda a pain.
turn on the car turn the wheel to the opposite the headlight your changing the bulb.
remove enough of the plastic fasteners the keep the fender-lining attached to the bumper and on the drivers side i needed to take an extra on in the top of the lining in the middle
squeeze your arm in between the lining to removed the watertight plastic cap off the head light - turn about an 8th of a turn counter clockwise
pull the wire plug off the lamp
there is a metal retaining spring the holds the bulb in place push it down and move up a little bit to release it.
pull bulb out...pay attention to were the metal tab sticks out so you can place the new bulb in easier..i didnt and it took about 15 min of spinning it to get it placed in right
just do the steps in reverse to put the bulb back in
all in all took me about an hour and i didnt remove the air box. if you need the FSM look on mysubaru.com under maintenance its page 11-50. its the hardest headlight ive ever messed with but still was easy enough to tackle myself and enjoy it
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