It’s not complicated. The Usenet provider gives you access to Usenet, and the indexer lets you search it for whatever you want. You then download it with a Usenet client. You can do it manually, much the same way as you download a torrent from any site. if you’ve downloaded a torrent before, you would be able to manage Usenet with no issues at all.

Or, if you’re willing to spend a few hours setting up the Servarr apps on an old computer like I did, you can automate the whole thing. I recommend this option, because you do it once and then you have a seamless way to fetch files from torrent and Usenet both without ever doing anything more than typing in the name of the show/movie. The Servarr apps search for, download, and import media into my library so that I can stream them to all my devices using Jellyfin (or Plex, if you like corpo apps). They even fetch proper subtitles for everything, and I also have it set up so after I’ve watched an episode, it’s deleted to make room for something else. It’s as easy as Netflix, at a fraction of the cost.