How do I withdraw Crypto through OTC trading?

Could you elaborate on the process of withdrawing cryptocurrency through Over-The-Counter (OTC) trading? I'm particularly interested in understanding the steps involved, from initiating the trade to ultimately receiving the funds in my desired currency or wallet. Are there any specific platforms or exchanges that facilitate this process? What are the key considerations I should be aware of, such as transaction fees, security measures, and compliance requirements? Additionally, could you provide any insights on how to ensure a smooth and secure OTC crypto withdrawal experience?