As for this time, there is still no updates if there is a network available for the bitcoin gold like mentioned above. And if the developers of BTG have updates for the wallets, etc and there's a go button, then you can export the private keys of your blockchain wallet using the 12-word seed. And you can follow this
tutorial so you can get the private keys and export it to the compatible wallet for BTG.
Make sure that you sweep the funds of your blockchain wallet to another wallet that you hold the private keys before you export your private key on BTG's compatible wallet.
will anything happen to my BTC in the blockchain wallet during this process ?