Good on you mate, and welcome aboard!
Assuming it isn’t you first time: there’s a slight learning curve, but once you’re passed a few months and you’ve resolved a few issues on your own you won’t look back!
Look into KDE extensions to customize your desktop just the way you want it! My windows wobble around or fizzle out of existence when I close them. :)
My first introduction to Linux was back in College in 2005. I ended up doing it off college but I’ve messed with Linux on and off over the years. A few months back I put GalliumOS on my Chromebook and I’ve done all sorts of stuff with the Raspberry pi. I wouldn’t say I’m proficient in the slightest and I know very few terminal commands but I think I can manage.
Oh, you’ll be fine then. Haven’t used Mint personally, but I’ve heard good things about it! Always reach out for help.