I would split it into two parts. First and most critical, is to set up your own address in a domain you control. As long as you control the address you can move it between providers. Then you can decide whether to self-host (which I would not) or use a commercial service.
The problem with home-hosted email is, as most folks said many times, that an email sent from a non-major provider would be marked as spam at best and dropped at worst.
My personal solution is to use my own domain, but have mail delivered by protonmail. This is an inexpensive option in a Swiss jurisdiction with generally sane laws. I maintain a copy of all emails on my home system, so if I wanted to switch from protonmail to a homegrown solution or another provider I can easily restore the same IMAP state there. And I would obviously keep the same email, so will not need to notify anyone of any email changes.
This is my setup too. One caveat w/ Proton Mail: you have to use their "bridge" software if you don't want to use Proton's client. Seems easy to configure, though I've never done it. Their web client is fine.
I use bridge and it is easy to configure and works great most of the time. And absolutely, completely and totally horribly a small fraction of the time.
Specifically, the bridge + Proton Mail combo reuses UUID. It is a known bug, which proton does not see as a big deal (we will fix it; someday; when we care enough). But what this means is that some messages may be mis-tagged, mis-labeled or mis-deleted between your mail client and the server.
I hit it when I was reorganizing my folder structure, freely adding and deleting subfolders from Thunderbird to create the structure I like. Then, the changes stopped reflecting and a fraction of my messages appeared gone. I finally was able to undo it through the web client, but the experience left me deeply suspicious of anything except the simplest operations with local client. And encouraged more diligence with making local backup copies of my emails.
The problem with home-hosted email is, as most folks said many times, that an email sent from a non-major provider would be marked as spam at best and dropped at worst.
My personal solution is to use my own domain, but have mail delivered by protonmail. This is an inexpensive option in a Swiss jurisdiction with generally sane laws. I maintain a copy of all emails on my home system, so if I wanted to switch from protonmail to a homegrown solution or another provider I can easily restore the same IMAP state there. And I would obviously keep the same email, so will not need to notify anyone of any email changes.