How to cash out millions in Bitcoin?

Could you elaborate on the steps involved in cashing out millions worth of Bitcoin? I understand that it's a significant amount and requires careful planning. Could you outline the key considerations such as choosing a reliable exchange, avoiding large transaction fees, ensuring the safety of the funds, and potential legal or tax implications? Additionally, what are some best practices to minimize the risk of losing money or getting scammed during the process? And finally, could you provide any insights into the potential impact on Bitcoin's price or market sentiment when such large transactions occur?