I am an absolute beginner in managing a big website, and it was also a giant "thing" to me to start this new job with an update of the forum-software and a radical change of the template-basics.
Fortunately my forerunner decided to user a ThemeHouse theme. It was easy and simple to install and customize the look-and-feel of our site. And because I am not familiar with customizing Xenforo themes, I am happy to have an helpful team in the background: The ThemeHouse-Boys helped me many times to find the "right button" for some configurations. Fast and with an uncomplicated processing.