I think I'd probably wait for a while before trying to load the new firmware. Often, it can take some time for a newly-activated device to register on the appropriate update server. Many folks will tell you that the changes that come with Android 7 aren't worth the potential risk of doing it yourself.
While you CAN load the update yourself with a very easy process, it is also very easy to screw it up and leave your phone unusable. The process will fail if you don't follow it in precise order, so you have to understand how and why the process works as it does and how to recover if things don't work as planned. Also understand that the firmware that you load must be the one intended for your model and region in order to work properly with your network. No mix and match.
Finally, I don't know what the impact would be on any warranty that you have for the phone if you load the new firmware yourself and have an issue that can be traced to an incorrect firmware (or the correct firmware incorrectly loaded).