Q: Do I need to withdraw my BTC from Coinbase?
... If you wish to access your coins on the UAHF
chain ... you should withdraw your BTC from Coinbase
to an external wallet address under your control by
July 31.
You can withdraw to a paper wallet without opening an account. You generate a new keypair, initiate a withdrawal from coinbase to your public key, and then can get both XBT and BCC from the private key later.