With the Coinbase coins, you just have to wait until they hopefully credit you the balance.

With the blockchain.info wallet and any other wallet where you control your private keys, you can get the private keys and import them into any wallet that supports BTG.

As for me, I got my private key QR code to show up on Electrum and then scanned the QR code with my phone's Coinomi BTG wallet. It worked without a hitch as soon as I got the QR code for the address where my BTC were at the time of the split.

Then I sent the BTG to HitBTC and sold them for BTC.

Make sure to move your real BTC out of the address before you attempt to redeem, though.