Step one, head to the store and pick up a Mobil-1 filter, #M1-204 or it's K&N equal, don't have any on the shelf but I think it is a 2004.
Hit Walmart and pick up a 5 quart container of Mobil-1 and a quart, the 4.0 takes 6 quarts. If you are going to be doing this on a regular basis just get a 6 pack of quarts and a few 5 quart containers, oil does not go bad
I usually buy 6 5 quart bottles and a 6 pack.
Pickup a drain pan, get the kind with a pour spout and that is closeable so you can dump the old oil back into the empty jugs.
Oil filter wrench, the 4.0 filter takes the larger ones, the K&N has a nut on the bottom and uses a wrench or a slip on wrench. I use a socket type for the mobil-1 filters that goes on a 3/8 inch ratchet.
Pick up a good sized grease gun, don't bother with the pistol grip kind and an 12" flex extension plus a couple of tubes of Mobil-1 or Castrol syntec grease.
The oil filler cap on the 97+ models uses a ratchet type cap, sometimes they get rounded off and won't remove when the engine is hot which is the best time to change the oil, you can pry the top off and grab the part thats in there with a set of channel locks and get it started then push the cap back on or fill it with epoxy and then put the cap back on, makes it a one piece cap from then on.
With all the parts handy remove the filler cap and the dipstick, set them aside, remove your wrist watch, put it on the console.
Put the drain pan under so you can look down on it from above the filter with both the vent and the big hole open.
Remove the oil filter, have a couple of rags handy. It will be HOT, use one of the rags and turn it off. As soon as it's free turn it upright to not spill any more oil and lift it straight out. If you ignored my recommendation of removing the dip stick and your watch you now know why I recommended it. Pull the dipstick with your right hand and set it across the top of the radiator. Now with your fingers nice and toasty lift the filter out and set it upright on the ground. DO not drop of rest the filter on or near the starter, tends to cause sparks when it hits the hot wire from the battery to the solenoid.
Take the new filter and put some of the old oil from the filter around the new O ring and on the threads on the new filter and install it. You will have to futz with it to get the filter threads started and at the correct angle, it should spin right on, if you have to force it or meet any resistance STOP, you are cross threading it, back it off and try again. Tighten it till it's snug then put the wrench back on and turn it about 1 turn till it's tight. OK, filters on.
Now get underneath on the drivers side, stick the correct socket on, I use a 1/2" ratchet and correct socket, the 1/2" ratchet gives you more leverage, back the bolt out to hand turnable, slide the drain pan under it so the leading edge is under the bolt and it extends to the rear, when the oil first comes out it will shoot about 8" back. I try to catch the bolt but that takes some timing to not get covered in old oil. Clean the bolt and let the oil drain for about 10 minutes, wait for the drips to stop. Reinstall the bolt, not gorilla tight either, about 1 grunt.
During that 10 minutes pull the grease gun out, pull the spring loaded T handle straight back and turn it so it locks, unscrew the front, put the cartridge in, pop off snap cap goes to the front, big hole goes to the rear on the cartridge, reassemble, careful not to hit that T handle and release it, messy. Release the T handle and push it straight down till it is like it was when you bought it. Now get under the front, start looking for zerk fittings, 7 of them, 8 counting the front driveshaft ON the driveshaft slip joint so it may not be visible right off, just run your hand along the front driveshaft, you'll feel it. One zerk, top ball joint, reach to back top of front tire, drop your hand, your fingers should feel the zerk, clean it off with a rag, you don't want to push dirty grease in there. Two on the track bar, just look at every steering joint, you will find them. The fitting on the gun pushes onto the zerk, pull the end to remove when done, give the new gun and cartridge some pumps to get grease into the flex end. The longer flex end will allow you to keep the gun on the ground and pump it while holding the fitting on the zerk with the other hand.
Now refill with oil, all 6 quarts, start it up, check you gauges and let it run for 5 minutes, check for leaks the whole time. Thats pretty much it.
I do some other things, can of spray lithium grease on all door hinges, hood locks, I spray silicon on all door seals after cleaning them with soap and water. Clean my windows inside and out, vacum, etc.
Lefty loosey, righty tighty.