I forget the year of your truck (you might want to fill out a signature in your profile that has that info in it). My 94 radiator shroud was held in with 4 bolts (IIRC), while my 97 had only two (and some locating tabs on the bottom). I remove the shroud and fan/fan clutch assembly together (see below for the fan). The stock metal fan has sharp blades, so be careful with them (easy to slice yourself).
The radiator hoses are straightforward (you can drain the fluid using the drain valve on the bottom of the radiator ... there's quite a bit, so have enough/big enough containers on hand) and if you have an automatic transmission, you will need to undo the transmission lines that go into the cooler that's part of the bottom of the radiator assembly. You will probably want to find some hose, etc. to plug the lines after undoing them so you are not dripping trans fluid all over.
To install the new fan, you will want a fan clutch wrench set to remove the fan and fan clutch as a unit. AutoZone will rent you a set for free. The AutoZone set part number for a PSD is #27141 (the others don't fit). One of the wrenches will go on the big fan clutch nut, while the other will go over the 4 pulley bolts (leave the belt on too). The fan clutch is right-hand threaded (righty-tighty, lefty-loosey!). A suggestion: I like to place a big piece of cardboard between the radiator a fan when removing/installing the fan assembly to avoid possible damage to the radiator. Once the fan clutch is undone and the shroud is undone, pull them up and out together (also the same for reinstall). Hope that helps. I'm sure I left something out, but the good folks here will be glad to point that out (... I mean fill in the blanks)