Regarding tools, maintenance etc ...
If you plan on having your bike serviced, new tires, added farkles, etc - do these at least two weeks prior to your trip. Rule of touring is any service completed just prior to trip will result in oil leaks, brake failure, or random crap falling off. This is the Law of the Gremlins.
If you have AAA or any other travel / wrecker coverage through credit cards etc, leave your tools at home. Most things that will sideline you will not be fixable. Caveat is you should take a plug kit and some CO2 canisters to prevent a flat. See above Law of the Gremlins. As long as you have that you can add a multitool and a few wraps of duct tape. But modern, well maintained bikes just don't break down like they used to.
Bring some good lens cleaner and a microfiber rag to keep your visor and glasses clean. Foam earplugs will drastically reduce your daily fatigue. Keep water and a candy bar handy for quick stops. Don't eat big lunches unless you plan on a mid day nap.
Force yourself to stop and take pictures. Those of us sitting at work etc can then live vicariously through your well documented trip report.