Points:
1. fan unscrews counter clockwise when facing the engine. See
http://www.beesvillebeefarm.com/jeep.html , scroll down a ways, for a picture of the bolt head in question and the allen wrench trick. I've used both the allen wrench and the socket on the bolt head, either way it's good to have an "extra" set of hands to hold the allen wrench or the socket on a rachet handle in place. A hammer of some sort, I have the Lisle pnuematic fan clutch removal tool, will likely be needed to get the fan to start to unscrew as it's on their tight from the factory and XXX thousand miles of rotating. A bit of anti-sieze on the reinstall may help future removal AND there is no need to snug the fan nut down on reinstall; just run it down to bottom by hand since the fan rotation is going to tighten it up anyway.
2. fan and shroud have to come off together the 1st time and it's good to put a piece of cardboard or a towel in front of the fan during that operation to avoid radiator damage. Do not misplace the fan shroud bolts as their length is critical; replacement with longer bolts will puncture the radiator.
3. several fan shroud mods make future removal easier. See
viewtopic.php?f=98&t=64278&p=709322#p709322 for several options including a link to the Aussie mod.