How do you sell your coins?

As a cryptocurrency enthusiast and investor, I'm curious to know the best practices for selling coins. Could you elaborate on the steps involved in the process? Do you recommend using a centralized exchange or a decentralized platform? Are there any safety measures one should consider? How do you determine the optimal time to sell, based on market conditions? And finally, what are some common mistakes investors make when selling their coins that you would advise against? I'm eager to learn from your expertise in this field.