It's actually fairly easy to chnage the battery with the right technique. I am "between SSRs" right now, so will need to do this from memory:
- Put the truck where there is plenty of light, OR bring a shop light under there
- Put the truck on a surface you don't mind lying on (i.e. NOT gravel or mud). Bring a piece of carpet if you don't want to get your clothes dirty
- Bring your wrenches BEFORE you crawl under the truck
- Crawl under the truck, to the REAR of the battery (don't be wimpy about crawling under there if you have no lift. There is plenty of room)
- Unfasten the NEGATIVE terminal, and wedge it where it will NOT contact anything metallic on the truck (or better, TAPE it WELL). THIS IS A SAFETY and ANTI-DAMAGE PRECAUTION SO TAKE IT SERIOUSLY
- Unfasten the POSITIVE terminal, and wedge it where it will not contact anything metallic (or tape it)
- Undo whatever else might be holding the battery in the box (I cannot remember, and I like I said above, I am currently between SSRs)
- Here is the neat part: The battery tray swings down a few inches to enable easy removal and reinstallation of the battery! Swing it down!
- Remove battery
- Reverse above steps EXACTLY to reinstall. ESPECIALLY the order of the terminals.
Some additional "useful data":
Do not drop the friggin battery . . .
Do not try to open the doors with the battery disconnected. They cannot "index" the windows down without the battery, so you will tear the window glass past the window seals - not good.
Do NOT leave the key in the ignition before removing the battery - that will LOCK the key there until the battery is back in!
EXPECT some re-learning by the computer after the battery removal / reinstallation, about things like (a) clock time and (b) the ideal air/fuel ratios for your typical driving, as it loses all this kind of stuff when the battery is removed.