SHOULD be just like my 04. 5 turn the "nut" and the cap comes off. the filter will come out with the cap, i would advise draining the filter houseing off with the yellow petcock lever. it is less messy this way. might want to catch the diesel in a container, come out of the clear tube on the bottom down by the power rack and pinion for the steering.
the filter clips into the top. be carefull not to break the tabs. the new filter SHOULD have a new O ring for you to install on the cap as well. i didnt use it the first time i changed it out so i would have a spare if i ever needed it. it stays in the glove box. im just paranoid though.
Grant