One obstacle you might encounter is carrier-grade NAT or CGNAT. Some ISPs put residential subscribers behind an additional layer of IPv4 NAT, which makes your public address inaccessible from the internet. In that case, you'll either need Tailscale or a similar service, or a VPS to act as a relay.

Then there's Vodafone who have unilaterally removed both the port-forward feature and bridge mode from their residential cable modems, and I hate them, and wish them a hammer to balls.