I bought this after I put one in for someone. It was simple to install and the benefits were pretty cool. I am pretty handy when it comes to most things. I watched the youtube video before installing it and it literately couldn't have been easier. The app walks you through the whole process even if you aren't to handy.
I downloaded the app and the created a Nest account. Followed the instructions and within about 30 minutes it was setup. I got the bundle with the Google Mini and was able to get it to announce that someone was at the door.
Later that night it activated my Nest trial for the month. I was able to get notifications for the whole month. I still haven't determined if I want to do the subscription to the service as all I wanted was the notification ability. Might end up doing it anyway as it is worth some of the advanced features.