No time to read everything. If someone can answer in short I'll tip.
I have several 10 BTC addresses (well before the snapshot). What do I do to easily claim the coin?
You go to
https://www.bitcore.cc/ and follow the steps.
You'll have to sign a message from each of those wallets. The message is the same, iirc it's BTX. You'll need a BTX address too, you can use cryptopia.