How to buy Metis with ETH?

As a crypto enthusiast, I'm curious about the process of acquiring Metis tokens using Ethereum (ETH). Could you walk me through the steps involved? Firstly, is it necessary to have an existing ETH wallet and a sufficient amount of ETH for the transaction? Secondly, would I need to locate a reliable exchange or platform that supports the Metis-ETH trading pair? Furthermore, are there any specific fees or commissions I should be aware of when executing such a trade? Finally, what security measures should I take to ensure a safe and secure transaction? Your insights would be greatly appreciated.