What's your process for making google dark mode?

If you want it on every site, including ones with no dark version, Chrome has an experimental flag for it - type chrome://flags in the address bar and search "auto dark mode for web contents". It forces dark on everything. Some images and logos look a bit odd, so turn it off again if it bugs you.

Where do you want it - google.com in the browser, or the app? On desktop there is a settings link on the results page with an appearance option for dark theme. Chrome itself follows your system theme, so switching your computer to dark mode does most of it, or you can choose dark in the customise panel on a new tab. The google app on a phone has its own theme setting in its settings. Menu names shift a bit between versions, so look for "appearance" or "theme" rather than an exact path. Some websites will still show light because the site itself does not support a dark version.