Easy if you go step by step and don't accidentally skip anything. Archinstall will get you to the same result with lower risk of failure, in a tenth of the amount of time spent. And unless you install operating systems for a living, it doesn't matter how you get there. Source: Installed Arch on about a dozen different devices, twice without Archinstall.
If you're looking to learn something, do Linux from Scratch instead. The process is way more granular, way more documented, and way more educational than parroting the steps of installing Arch from the wiki.
Arch offers a combination of rolling software updates, a simple but easily customized base, pacman for the package manager, the AUR, a barebones installation process by default, good documentation, and active development. That may or may not be a good combination based on your goals.
Other distros offer a different combination of characteristics. Those characteristics are a starting point and you can get to the same destination no matter what you use. The trick is figuring out what starting point is closest to your destination or which starting point makes the journey fun for you. For some people, Arch is that. For plenty of people, Arch isn't that.