I worked in enterprise IT for years, including running mail servers, and ran my own personal servers for my home domains for years. The best feeling ever was outsourcing that responsibility. If you want to do it for fun or learning with a test domain, I’d say go for it. If you want to do this for email that might matter, I would not do that. For an illustration on why, research email delivery and email reputation topics. It’s not that everything is too complex, but you can easily have something to wing without ever knowing and you just lose email.

If you want a good middle lane, I moved my personal domains to mxroute after buying a lifetime plan. I also know and have tested failing over to a second provider if needed. This let’s you make as many accounts and aliases as you want, without dealing with all the delivery issues personally.