check the measurements of your current filter (should be on the thing itself) and go to either lowes, home depot, or your local hardware store and buy one similar.
there should be an air canister, with a tube leading into the throttle body. u can remove this tube and unscrew the bolt to get the old air filter out.
#1.
Have the dealer or other service tech do it for you. You have to REMOVE the band-clamped duct to access the filter housing(if it's the same as a 2002). Then you have to try and get it back on!...