Drive onto ramps. Get out creeper and slide under the front bumper. Look up at the plastic panel that keeps crud from hitting the radiator and A/C condenser. You will find the oil filter access panel held up by a single 1/4 turn fastener. Drop the panel down and the filter is on the adapter about 3" up from the panel.
When you go to get a new filter there are two that will fit your truck. One is listed for a two wheel drive and one for 4X4. I use the larger filter for a 2WD since it fits fine and has more filter area. The 4X4 one is meant for the older S series that have a tight filter location inside the fender under the hood.