If you’re not the kind of person who wants to unlock your phone’s bootloader, I can’t blame you. Google lets Pixel owners enroll in the beta by simply logging in with a Google account, then selecting the compatible device that they’d like to install the beta. You’ll get an over-the-air update that way, just like you normally would for stable versions of Android.
Once you click “Enroll,” you’ll eventually get an update notification on the enrolled device that a system update is ready. You may need to check for a system update in order for it to fetch the beta software, but it usually doesn’t take long for it to be ready for download. (Google says it could take 24 hours or more, but we’ve rarely had to wait that long. The beta hit one of our phones less than a half-hour after enrolling it.) As new Android Q developer previews come out, you’ll get a notification to install them, too, as you would for any regular system update.
Alternatively, you can flash the Android Q beta to your Pixel phone. Google has provided a list of image downloads for the supported phones, but you should only take this road if you’re a developer, or if you just like to do things the hard way. Phones that are updated in this manner won’t receive over-the-air updates to upcoming beta versions, so if you want the latest Android Q features without much hassle, just enroll in the beta instead.