You will need a very big wrench. Usually you can only get them from Snap on or other tool distrbuters. Could try napa, might have some luck there. Just tell them what your are doing A good size hammer (22oz) would be helpful to smack loose the fan. They are reverse threaded too.
On real stubborn fans I have someone with a pry bar put tension on the serpentine belt to prevent the fan from spinning and I smack loose the fan.
Once its loose I believe its just 4 bolts for the clutch fan
Hope this helps!!