There are very simple options to selfhost a VPN nowadays. For example, Amnezia allows you to just type your server ssh credentials into their mobile app, and it will automatically set up AmneziaWG on your server and add it to the app. You can then create Amnezia or plain WireGuard config files from extra devices right from there.
That sounds like I'm putting a lot of trust in an app. Also giving it control over my server, which I guess is not a big deal if the server is a disposable VPS
