I wore a 5.11 shirt it's got 2 secret pockets inside for all the good stuff you don't want to loose.
(shameless plug 5.11 clothing available on my website, buy some it's great and I need the money for my own selfish needs)
I carried some $'s ,£'s and euro's did stop in some really small town for petrol and they looked at me like I don't know what when I wanted to pay with plastic.
When you cross the various borders the bigger petrol stations will also have exchange kiosks in them if you need abit of cash.
make a folder with all the forms in it in order make photo copies and leave them at the bottom of luggage in water proof ziplock bag, I also scanned all the doc's and posted them on my ftp. but you could email them to a hotmail account so you could if need be get them again locally.
GPS was abit Hmmmm most of the time it showed me riding across fields
and that was v9 then again stupid GPS cable came unplugged at every corner cos I made it too short...
Best bits
Loads of space no people
Hot Chocolate/ coffee with Amerretto ish stuff in it
The weather well when it finally got sunny it was stunning
smashing looking local bits of stuff also came out when the sun popped out...
Bad bits
getting lost near dark
dropping the bike in the woods
watching Hannibal rising before camping in Poland
Nearly getting run over by a really big truck in Lithuania
hitting a strip of potholes at 90ish that woke me up
hope that helps