I wouldn't say it's hard - you don't need to tweak anything if you don't want to; one of the features of Debian is that all the packages are configured ready-to-go when you 'apt install' them.

For installation, use a tool like Rufus to make a bootable USB drive.

Use https://cdimage.debian.org/debian-cd/current-live/amd64/iso-... - KDE is a desktop environment that will feel pretty familiar if you are used to Windows.

Rebooting into the USB drive, you can try out KDE, or can go straight to the install process - it takes less than half an hour, even as a beginner, and if you don't understand something, just click next and it'll be fine. There's a graphical partitioning tool included in the installer. If you don't need everything to be FOSS, you can select non-free repositories to make some proprietary software easier to install. These aren't officially part of Debian, though, so remember that you can't get support on the Debian forums/chatrooms/bugtracker for proprietary packages.