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3. After the fork find someone who owns coins not existing on the both blockchains and ask them to send few satoshis to your account, do it for the both blockchains. Those lucky owners of coins that don't exist on the other blockchain will likely be miners or guys who managed to get their transaction not included into the other chain. I expect that the market will react to the fork by selling such special coins slightly more expensive than their face value.

4. Find exchanges that work with different blockchains and send your coins TWICE by combining your original coins with coins obtained on the previous step. This will prevent a transaction on one blockchain from inclusion into the other blockchain.

5. Sell your bitcoins on the both exchanges for fiat and watch market reaction. Once the market decides which blockchain wins send fiat money to the corresponding exchange and buy bitcoins. If you are a skilled trader you may try to exchange BTC for LTC or another altcoin instead of fiat. Do it at your own risk, I don't dare to predict how altcoin markets will react to the fork.