You will need two helpers, a decent tool set, a 4 1/2" angle grinder, air(optional), a 1/2" breaker bar, an engine hoist, and 8' "4x4" post, cardboard, a die grinder, chain, and some GOOD penetrating oil.
Take the bed off of both trucks, then remove the front clips, then disconnect the bab(steering shaft, wiring-had a 3/8 head bolt holding the plug in, speedo cable, e-brake cable-cut it, remove ground straps and fuel tank stuff), then take off the doors and run the 4x4 through the cab using the cardboard to protect the cab. Lift the cab and have your budies steady it. Then do the sme to the donor truck and put the good pieces on the 4x4 chassis. This will take no more than 3 full days.(I did a 79 body swap when I was 15 to build my first truck) post any questions and I will see that they are answered.(don't consider anything too stupid either, this is not a very easy swap)