[dsraven]

joedoh makes some great points. don't try to get everything apart in a real rush. take apart slow enough to take pics, bag and tag stuff that goes together. assemble nuts on studs and bolts back in holes etc. sometimes you think you will just be storing the parts until you get that part done and have plans on a certain way you wanna build something using something else then chucking those parts later anyway. well, things can change during a build and then you are left wondering where the heck that funny looking little bolt went or how did this go together again? you can figure it out but it is easier if you can spend the research time actually working on the truck instead.

-take a pic of the item assembled. download the pics at the end of the day onto a memory stick or at least a file appropriately named. you would be surprised to find how hard it is to remember the little things like how the door rubber goes on or some other minor but important detail.
-dissassemle it
-put fasteners back in holes and nuts back on bolts etc to simulate how it was taken apart, not just mumbo jumbo
-bag it
-tag it
-box it
-label the box. sometimes a date can be good to put on it too. then you know how long it has been since you bagged and tagged. it will surprise you.

-another good point made. if it was a running driving donor the sometimes it is best to leave it a running driving drivetrain. pick the right donor and the build will go better. it's nice to keep momentum going when you assemble some stuff and you can actually get it to start and drive. doing an engine swap after is sometimes better because it is do-able in a short burst project, like a long weekend engine swap.
-another good point made. keep units together if possible, like the front clip. it is moveable with an engine lift by yourself for fitment as you go through the swap or easily and faster with a buddy helping. it takes less space to store as a unit and there are less fasteners in bags etc if it is still all in one piece. that way the frame swap is shorter time duration because the clip either fits or it doesn't and more work is required to make it fit. less guess work on wheel fitment in the openings etc
-another thing guys will do is start collecting a bunch of parts from like vehicles because they are possibly in better shape. thats a great idea if you have the space. I suggest to keep the doors with the cab they started with until the frame swap is done though, then swap them OR swap and fit the doors before taking anything apart and then brace the cab so stuff stays put. if you start with a floppy cab and don't brace anything up before you take the cab off because you plan to fix the holes after, you may find the parts don't fit well when they are pushed back into the spot where they were supposed to be in the first place.