1) Drain the gear oil out
2) Unbolt the pan
3) Remove the 4 (or 5, can't remember) bolts holding the filter on
4) Bolt new filter in
5) Clean magnets and pan of any sediment. Put back in pan.
6) Clean RTV sealant off pan edge
7) Reapply new RTV or put new gasket on
8) Bolt pan to transmission
9) Fill with fluid
Autozone has a transmission maintenance kit for about $30 that has a new gasket and filter in it. Once you have all the bolts to the pan out, it slides to the rear of the truck and disconnects from the filler line. You'll find the majority of your time aligning the pan to the bottom of the tranny so if you have a jack or something that can hold it up for you it helps.