You could start by using the connection test on the mullvad website that checks for 3 different leaks.

VPN use is not illegal (yet).

Your ISP can still match your internet traffic to the act of torrenting - however they can not know what you are torrenting and the act of torrenting itself is not illegal.

Theoretically - using torrents to download free use material like you are going to do is 100% legal and above board. So what if you are choosing to use a VPN while doing it?

So when the shit for brains nazi starts driving off at the end and actually does almost run over someone… Im assuming that someone had cause to unload a full clip through the windshield if they had a gun and get away with it, right? Right??