The first step was getting the old rotted bed off. I didn't have access to many tools at that point so I just used a hammer and pry bar. It probably took 8 hours total. I thought it would just fall apart with a little effort but he had gone all out with the supports a structure.
That's a somewhat blurry picture of it about 98% demoed (don't mind the messy garage). My next step was rust treating, priming, and undercoating the whole thing. Had I been more strategic about it I only would have undercoated specific parts but I decided to do the whole thing.