You won't find any step by step instructions on removal in a service manual. Basically, there are usually a few mounting screws holding the entire fuse block/box in place. After removing them you need to get as much slack as possible to pull the fuse block away from the panel so you can reach behind it. Some harnesses are held in place by a push nut that goes onto a welded on post. So, you can pull on some of these and get some slack.
Behind the fuse block there are connectors just like the ones you would find in the rest of the wiring harness. You have to feel around for the release tab, puch it while wiggling the connector out and then the connector should come free. There will be a few connectors and at least one ground and a few single terminal wires.
The fuse block should then be able to be removed. Careful not to damage any wires as you will have to move it around to get it out.