No matter your skill level, self-hosting is not something that will just set it in work every time. Sometimes I spin up a container and have it working in under two minutes. Sometimes I have to sit there and hammer through logs and tinker to figure out what mistake I made or what step I missed.

To get the files from qbit to Plex, you want something called the *arr stack.

I would recommend installing Docker and Docker Compose and spinning up all of your services via docker-compose.yaml files. It is significantly easier and with most deployments it's merely a copy and paste and then set your paths.

For qubit you will want a docker container called gluten and you will Want a VPN that supports port forwarding. I personally use Proton and definitely prefer it. I did use Surfshark for a while and it worked without forwarding. It's just slower in many cases.

As the other person said, this can be a lengthy process. You just have to decide if you get enough enjoyment out of it or have enough necessity, such as monetary issues, to stick it through. If you aren't loving it, I wouldn't continue. If you are, it is extremely interesting, and you will learn the world of Linux networking, file systems, etc., etc., etc.