I think that it would be a pretty dumb idea to instantly sell your BCC right after the chain splits, if it does. If it accidentally gets broadcasted to the bitcoin network, then you are basically screwed as you would have just lost your BCC. I would personally wait at least 2 or 3 days before making any sort of transactions, or at least until theymos gives us the green light. I have a ledger wallet so I can use both codes, make sure that you are all prepared for the split.