Definitely not, I’d say the thing you need the most is the will to learn - as there are differences of course, but being willing to learn new things will go a long way.

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.

I’ve no idea. That might be a windows thing. I don’t use Windows.

Specially if they’re touch typists and they use the Ctrl opposed to the letter key as one usually does with Shift.

I don’t hate. I like a good keyboard.

Now, do I think obsessing about the extremely specific properties of switches and keycaps and spending hours manually embedding each individual key component just to get a specific color combination makes sense as a hobby? Hell no. But then neither does collecting stamps or watching people’s grocery runs on Youtube. You do what you want, and this hobby at least lets you put whatever icon you please on the Bixby button.

I’ll say this, though, that justification, which I have used often to myself and others, is a terrible rabbit hole of mismanaged finances. That is true of your monitor, your PC, you laptop, your phone, your keyboard, your chair, your desk… by the time you’re done you’ve spent a year’s salary setting up your workstation with absurdly luxurious, custom gear that sometimes makes no discernible difference. By all means get whatever stuff saves you from injury and provides comfort and satisfaction, but we all know in many of those categories the quality curve flattens out way before the price curve does.

Also, I guarantee most people with a custom keyboard swap it out more often than people who are still using the crappy board that came for free with their prebuilt or was given to them at work. I have dirt cheap Dell keyboards that still work fine. I may not love how they feel or sound, but it turns out we mastered the art of making buttons a while ago and closing a circuit with a conductive pad reliably is not a particularly costly proposition. Hey, buy good keyboards for the feel or because you have a glitzy hobby, but don’t lie to yourself or me about it. You’re a grown person, own that superfluously expensive nerdy taste. If boomers could brag about their fountain pens you can smugly bore your friends talking about the injection molding in the keycaps matching a specific pantone that you bought.