After trying out a few distros over the last 20 years or so (openSUSE, Ubuntu, Debian, Arch, Fedora and Silverblue were the ones I actively used for a stretch of time on desktop, Debian and CentOS on server), I also landed on NixOS.
Who knows what the future brings, but things feel more settled to me than they ever have. Maybe that’s because there’s a (declarative) solution for every custom setup, it’s just a function of time and profiency in Nix. Or maybe it’s because I invested quite a bit of work into a trivially reproducible setup for most of my machines and workflows (all in one glorious version-controlled flake), that the sunk costs are too high to switch elsewhere.
I’m still willing to experiment with DEs/WMs, currently running Gnome on my main and Sway on weaker machines. Hyprland is a bit out there for my taste, but I’m really looking forward to giving Cosmic DE a try once it’s ready.
You can get pretty far with copy-pasting. If you want to try it out, you should first realize that there’s always 10+ different ways to do the same thing. Stick with what works and with what seems the most intuitive to you.
Personally, I suggest going straight for a flake-based setup. Flakes are somehow still labeled experimental, but they’re actually mature and broadly adopted.