My knowledge on automatics is pretty slim this I do know:
You will need a fan clutch tool. Unlike the manuals, that have an electric fan automatics have a mechanical fan. This means you need a special tool and the process is different to remove it. I also have heard that the 32mm nut on there is reverse threaded so be careful.
Maybe someone who has done an automatic can share a little bit better. Besides the mechanical fan I believe the rest of the process is almost exactly the same.