For personal use, I like Bitvora's Haven. Obviously, the hardness will depend on your familiarity with CLI based setup. But it's very well documented.
https://github.com/bitvora/haven/
For gang/WoT settings, same builders but wot-relay:
https://github.com/bitvora/wot-relay
All in all easiest ease would be Nostr-relay-tray, but you have to feel comfortable hooking up a stranger's proxy to your machine to make it public:
https://github.com/CodyTseng/nostr-relay-tray
Hope it helps!