If it needs changing eg brake pads do it before you leave otherwise bad things can happen, just ask one of my riding mates who ignored this advice and frazzled his rear caliper in Germany 
Pack light and take waterproofs!! I always take more pants and socks then needed, being ex military if your feet and bits are comfy and OK then all is right with the world. A spare pair of riding gloves is also nice. Don't try and do too much each day as the trip becomes a mission, which defeats the object.
Drink plenty of fluids and snack on nuts etc not chocolate bars and they only give a short lived fix.
Speed wise think tortoise and hare, you will get better mpg, which means less time lost through stops....... Took me years of blasting up and down the autobahns to Slovakia to learn that one 
Kick back and enjoy and keep posting
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