If the plugs have corroded, WD40 should ease them so you can separate them without pulling out the terminals.

There is a main engine loom multiplug around the alternator/starter area,then if you look under your dash panel there are two smaller plugs one you can just pull through the cab floor and the other goes to a plug in the steering column cowl once disconnected can also be pulled through the floor.Everything else was no problem because l had no seized bolts etc 2 hours tops would be a realistic target.
Cheers Tommy