There's a few recent guides on Reddit that discuss this and automation. I got access to some private torrent trackers this year, but haven't touched them since I got my Usenet subscription. I've been waiting decades for it to be this easy once you get it set up.

If you already have that automation part going, this should be pretty straight forward. Add a Usenet download client to your *arr programs, put in the account info from your Usenet provider, add on your account info for nzb trackers, and it works just the same except with more consistency and speed.