I'm in the middle of my second full restore, so here are my 2ยข:
1 - Take lots of pics and video during dis-assembly.
2 - Group assembly nuts / bolts / hardware and place into ziploc bags with a piece of card. Write down notes about longer / shorter bolts, did it come from port or starboard, etc. If you need new hardware later, you can simply take the bags to the store and match everything up.
3 - Meter test your wiring harness while it's out. Repair frays, crumbling end connectors, etc. If it looks bad enough, consider one of the new replacements available on ebay from Porch Electric. Their harnesses look just like OEM and customer service is outstanding.
4 - Test your starter / generator. Good time for a rebuild with new brushes and bearings along with a fresh coat of paint.
5 - Consider matching your automotive paint to the correct Cub yellow from a rattle can. Makes touch ups easier down the road. Plus, I paint all the small stuff like seat hinges, carb linkages and small brackets with rattle can yellow. This will allow you to paint the small stuff moments out of the sand blaster (with an alcohol wipe down). The paint will stick very well and your parts won't sit around in primer for a month gathering dust before final paint. Primer is a moisture sponge. Paint bigger pieces like the gas tank, hood, fender pan with the HVLP. My cutoff for rattle can pieces is about the size of the air cleaner.
Feel free to contact me by PM or cell if you have more questions, it's a fun hobby. Here are two links to youtube tractor restorations. The first one is a good friend's restoration of a Cub 129 and the second is the one I did on a 1967 Sears Suburban:
http://www.youtube.com/watch?v=cIAJH...7&feature=plcp
http://www.youtube.com/watch?v=NSBSzP9Aio4