I just jumped in headfirst. I love it. It's really just Nix, but with options to configure your whole system to your liking.

Stability's been rock-solid and I haven't yet encountered anything truly headache-inducing.

Here's some starter advice:

• Try to start with flakes. Nix channels are known for being...unreliable at times.
• Start small, slowly extend. Many people's Nix configs are often insanely abstracted and modularized. Personally, I started my flake config by installing KDE + Nix, and then linking the configuration.nix to the flake. (Remember, flakes just package the config, they're not responsible for configuring the system).

My Nix config is relatively basic (check it out here, so feel free to look around trying to understand it. I'd also suggest using Home Manger if you aren't already.

The NixOS forums are great for getting help. I'll also point you towards the Catppuccin Discord server, the NixOS thread there is filled with many helpful people who helped me get started. (If you decide to swallow the Nix pill, feel free to join and ping me(my username's Dukk); I'll add you to the Nix thread).