Barbra, I couldn't find Durand on the map , what part of Illinois are you located. I'm in Grafton, just north of St.Louis area.
It would be nice to see the shed, or some pictures.
Just a couple of thoughts,

Take lots of pictures of the building as you are taking it down. They can be very useful when you're putting it back up.
There are as many ways to label a frame as there are timberframers. I recommend having a drawing of the frame to make notes on as you are labeling the frame and keep it simple.
A building this size may not need to be taken completely apart, you may be able to move it in sections( fewer parts to keep track of).
Tom.