How to add lido stETH to MetaMask?

How do I successfully add lido stETH to my MetaMask wallet? Could you please provide a step-by-step guide on how to navigate through the process? I'm particularly interested in understanding how to locate the correct contract address for lido stETH and how to ensure a secure and smooth addition to my wallet. Would it be possible to encounter any challenges or errors during this process, and if so, how can I troubleshoot them effectively? Additionally, is there any specific advice you would recommend for first-time users who are adding lido stETH to MetaMask?