flakes VS fennecOS

I'm wondering if I am starting to get too old to learn new things but could someone ELI5 me how to install dotfiles like these? I feel like I should get this at this point but at least I can install nixOS and setup my WM and apps manually now so at least that's something.

I love nix, I've been using it for the last 2 years, I have a very stable setup from these 2 years of effort [0], and I just can't recommend Nix for Linux beginners, why?

Well, because everything is scattered, you have to consult many places to find out how to do things with Nix, here is my workflow:

Usually, when I need a new complex program, like Steam, I first check the system-wide configuration [1], the wiki [2] and the package list [3], if I just want it on my user, I need to check if Home Manager has an option [4], if it doesn't, I can just use the "home.packages" option. Now, if I need to override something on the package, I need to remember how to do it with [5] [6] (while checking the source code for the package in parallel to find the options).

And then sometimes, on very rare occasions, I need to fine tune something with the nix language, so I need to check the builtins/lib docs [7], but some builtins are not there, so I need to either use nix-doc [8] or find the docs inside the code-bases [9] [10] (they are split between both repos)

[0] - https://github.com/shiryel/nixos-dotfiles