If your fan is the same as earlier models, you need a 36mm wrench and some way to hold the fan pully. Some use large Channel Lock pliers and a helper. The fan nut is LEFT handed and it's on there pretty tight. Some have had luck with a flat nosed punch on the nut, but I just buggered mine up when I tried that. I hit the wrench with a dead blow hammer a few good licks and the fan nut came loose.
In order to get the shroud off you need to take off the coolant and windshield washer bottles. They are a little tricky because there is a nipple on the back that fits in a hole in the bottle holder.
I hope they have improved this setup for your truck, but that would surprise me.