Others have commented on the process. It's easier than you think.
One thing that might confuse you at first (after successful install) is that when you change between operating systems, the system clock gets thrown off. That's because Linux and Windows interpret the system time differently (local time vs UTC).
To match Windows behaviour in Linux run:
sudo timedatectl set-local-rtc 1 --adjust-system-clock
To match Linux behaviour in Windows you will need to edit the registry, I'll leave that up to you to search.
Haha yep! Your timezone is in that danger zone where it's not wrong enough to be immediately obvious.
If you make a Windows USB install and boot into it, you should be able to run some Microsoft tools to try and repair the installation. You can search further for it, might be worth looking into if you have anything you want to access on there.