Its going to be easier to unplug the coil packs. On each valve cover, there is a wire harness plug. Its has a blue side lock. Pull that out, and unplug it on each valve cover.
This will also allow you to do a wet compression test, as the fuel injector will allow the fuel into the cylinder. Its not perfect. But it works.
There is a fuse/relay to pull, but what it is, I am not sure.
Per this video, at the 27 second mark, its fuse 5, a 15amp fuse. You can verify by pulling it, and attempting to start the truck.