Cool, so we need two things, The most streamlined installer possible. "Grandma's Universal Nix.Conf"
The installer should be written using 4th grade simple english, no jargon
In the top right corner there should be a language selector.
There should be only one page of questions.
The installer should work completely offline.
The installer should detect all peripherals and modify the nix file accordingly.
The second page should only be tge warning about erasing everything
The installer should detect if a nixos installation already exist. If it does, then offer the user to repair the bootloader
Optionally, the installer coukd detect a windows installation. Check the amount of free space left on the drive.
In this case instead of a wipe, offer to shrink the windows partition and install nixos in the liberated space. Install a bootloader setup for dual boot. Auto mount the ntfs partition and place a shortcut to the c:\user folder on the desktop.