First, you'll need to enable developer mode on your Chromebook, which is easier than you think. Just head to your settings, click on "About Chrome OS," and then click on "Detailed build information" - from there, you can toggle developer mode on. Then, you can install the APK file, and you're good to go!
The process is surprisingly straightforward, and you don't need to be a tech whiz to figure it out. Just make sure you're downloading APKs from reputable sources, and you'll be all set. Easy peasy, lemon squeezy!