The method coinstash gives is absolutely the right thing to do. Substitute Jaxx etc for Electrum-LTC as your prefer.

And remember the golden rule: NEVER paste private keys that hold any currency into ANY website or wallet in order to claim forked coins (including ours). Practice responsible forking! 1. Wait for the fork; 2. Move your Litecoin to a new address; 3. Use the private key for the "old" address to claim your Litecoin Cash.