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I would advice calling your dealership and setting up a meeting with the technology specialist. Every dealer should have at least one. They come in and show you the basics from operating nav to pairing your phone. And it's free!
Like any new car, it can take a little time, but most should come quickly the more you use it. I have a 2015 too and it was my first Lexus, but the more I played with the features, the more it was easier to use.
There were a few things I had to ask the dealer about on my first visit, including the Enform, but they were very nice about how they stepped me through it and now I'm more comfortable with everything and I still learn more things all the time.