Buy a new SSD or hard drive. Take the existing one out of your computer and put it in a drawer. That eliminates the possibility of the Linux install somehow messing up your Windows drive. Put in the new drive and do your Linux install onto your new totally empty drive. Now you can always go back to Windows by swapping the drives again.
Seriously, Linux installation is pretty easy if a bit time consuming. I generally use Debian MATE since I don't like Gnome. Go to https://cdimage.debian.org/images/release/current-live/amd64/iso-hybrid/ , copy debian-live-12.5.0-amd64-mate.iso onto a USB flash drive, set your BIOS to boot from USB, plug in the flash drive and boot and follow the prompts. Give yourself an hour or so for this since the installer is going to install 100s of packages one at a time. You mostly won't have to interact while this is happening though.