I would say for Linux Mint Cinnamon you really only need to be able to follow directions. Just make sure you have an external backup of all your files in case it turns out you can’t. You’ll have to type some stuff into a command-line interface (I think) but the Mint Cinnamon website has links to step by step guides. Also, you know, make sure you’re either committed to getting rid of Windows, or have the ability to re-install, in case you mess up.

But really, at this point, it’s pretty dang easy.

No Mint pretty much just works.
Great thing about Mint (or most Linux distros) is that you can try it by booting from a usb stick - see if you like it that way.

The only thing that I think is a little complicated these days is make sure that you’re not reliant on a particular Windows-only app. For the vast majority of common apps, you’re going to be fine, and it’s sounding more and more like even gaming on Linux is not only fine, but getting to the point of being the best way to do it. If you do have a particular app you rely on, I’d look into the various ways that you can get Windows apps running on Linux (which can be a little tricky, but usually not too bad.) But even like 10 years ago, I built a machine for an elderly family member, put probably some flavor of ubuntu on it, and I never had to troubleshoot that machine.