Mike: In one sentence you've asked a question that has taken some men years of work and learning to get the answer to.
Recently I took a course put on by the guild that taught us how to make a drawing and measure a frame, tag the frame and then dismantle it. This course lasted two days, and we just scratched the surface, of all the different things you need to learn and understand. In July we will hopefully be repairing the damaged parts and re-assembling it in another town. If you have the time you should look into coming to the re-assembly process and learn from the men who are putting it on/together.
As part of the above mentioned project, we had a tour of some other barns, near by, that this same preservation company had been working on. There were two barns at this site. One was to be used as an office building for the owner and his wife. The preservation company was having trouble re-fitting this old barn to higher standards needed to comply with current building codes for it's intended use. The retro fitting was costing huge amounts of money, more than had been expected.
My first advice to you, about converting this barn into a home is, check with your building inspector or building department of the area in which you intend to re-assemble this frame, to see if they will allow it to be converted into a home. And what new standards that you might have to comply with in order to do just that.
A tagging and labeling system for the frame parts is pretty straight forward and isn't hard to learn.
Removing the pegs and not breaking them off, causing the need to drill out the hole, takes some skill.
Proper temporary bracing with new 2x construction grade stock to hold the frame together as it's un-assembled is a must to insure that the frame is not stressed out and tenons are broken. And of course for safety reasons.
Use of a crane to lift off parts in the reverse order in which it was assembled may be necessary , again to make it safe and not break any parts.
We saw a lot of timbers that were in a great deal of stress, and after they were released from the frame, some were twisted, and bowed.
Learning how to, or which part to, take off first is important. As one instructor said, “it's a giant puzzle and you've got to find the last piece put in/on and remove it first. And then continue in this reverse order until the frame is completely disassembled.” Understanding which piece was "last' may take some careful study of the frame. And then following the plan of un-assemble is very important. Good luck with your project, Jim