Noob Question: If I have ETH in a GDAX account/wallet and it existed prior to the fork, is it still possible to split using Mist? I assume I have to send my ETH from GDAX to a Mist account/wallet??

Sorry for the dumb question, but I'm really just interested in splitting my ETC and getting it onto an exchange so I can sell it. But I've never done anything even halfway complicated with coin, and have never used Mist...

Any help would be appreciated!