Pack, un-pack, pack, un-pack and do it a few times, streem lining down to your minimal load. With a trip like this, lighter is better. If you have stops pre-determined, get the address of post offices, libraries and laundramats.
Buy what you want to as momentos, and ship them home from those USPS at your stops.
And what ever you do, don't take your itinerary to seriously. Change is good, and can actually be the highlite of your trip.
And above all, have more fun then you can stand, get good nights rests and hydrate, hydrate and hydrate some more. And don't forget Tums or Pepto, diff. meals in diff places can play havoc with your digestive system.I am sure you will get list that can give you a great headache, look them over, try them and then go.
And don't forget to keep us posted.
Ride safe all.
Greg