Masto.host makes hosting your own Mastodon instance really easy: they do the installation, maintenance and upgrades, you do the non-technical stuff. You can follow them at:
More info on their website at https://masto.host
I started hacking a webfinger-proxy for this purpose :
It seemed to work fine, but I got discouraged to do so by core dev of Mastodon, as it would have some wierd side effects apparently :
This is a brand new server run by the main developers of the project as a spin-off of mastodon.social It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!