Hard for a "layperson", maybe. But IMHO for someone interested in self-hosting this probably should not be a hard problem to solve, or at least a decent "warmup exercise" to see if you'd like it.

I say this because you don't even need to write the script yourself, there are plenty of preexisting applications that can be configured to notify you of updates to an RSS feed.

I'm sure I could whip that up in changedetection.io or Node-RED pretty quickly, for example.

I don't use a dedicated RSS feed reader app, but I'd also be somewhat surprised if there isn't one that supports some form of push notifications.