How to buy RNDR on MetaMask?

Could you please elaborate on the process of purchasing RNDR tokens using MetaMask? I'm particularly interested in understanding the steps involved, from setting up an account to executing the actual purchase. Also, would you mind sharing any potential pitfalls or common mistakes to avoid when navigating this process? It would be greatly appreciated if you could provide some insight into the fees associated with buying RNDR on MetaMask as well. Thank you for your assistance in clarifying this matter.