Nowadays, there is more and more content on web-analytics, and it is sometimes not justified to hire a consultant who possesses so-called sacred knowledge. But it is only partially true.
In difficult situations, I turn to Roman Rybalchenko.
Out of several ways of solving a problem, Roman will always suggest the most efficient one. He was helping us in the transition to Enhanced Ecommerce. He told us about different ways of overcoming Google analytics sampling. As well, he dispelled my illusions about how the calculated metrics are formed in GA.
The main thing is not the information itself but the way it is configured and gradually presented!