You can use the guide to install just Jellyfin and Qbittorrent.
You’ll have to do what the *arr are doing manually — search torrents yourself and track down each episode etc., then add them to Qbittorrent, then transfer the files to where Jellyfin expects them when they’re done downloading, look for subtitles etc.
It’s not as nice as the *arr setup because it can’t “take requests”, basically you have to be the one to get the stuff that your friends and family ask for and manage it with Jellyfin… on the other hand it’s much faster to get going — and you can always add *arr stuff later, one by one.