My 2 Cents worth,
Make sure that your bike fits you and get all the components serviced prior to departure.
Check that all your camping gear works and you know how to use it with your eyes closed, practise putting up your tent/ sleeping arrangements in the dark/ low light.
Go for a weekend shakeout trip ( after the bike service) and make any adjustments required with bike and gear before you go on your big trip.
My 2015 Trip
I completely agree with you. I like your suggestion of practicing in low light. What would you suggest for servicing other than a general tune up. I heard "trueing" the wheels (whatever the **** that means) will help prevent broken spokes and I'm thinking of applying a rust inhibitor to the inside of my frame (Steel LHT). Anything else? Also, nice blog.