It's important to remember that not everyone's a whiz when it comes to the command-line aspect of Android. And to that end, the fine folks in our forums — 1.6 million strong and growing — have you covered.
The over-the-air update that brings the Nexus 4 to Android 4.3 is pushing out now. But if for some reason you haven't gotten it yet and you don't want to wait any longer, Phalgun Gujjar in our forums has a nice little tutorial for sideloading the update. No, it doesn't root your phone, and it's really no different than just waiting for the update to push out. It's quick and it's easy and it's a great way to learn one of the basics of working with your Android phone with the command line.