Is it necessary to do all the things in the Guru Yoga text?

In the Guru Yoga section, there were many things said about the topic of the lama—many things about how to meditate upon Guru Yoga. 

But actually there are different types of individuals with varying capacities, and in particular there are those people who are appropriate vessels for practicing the Secret Mantra Vajrayana. Such people should be able to practice according to all the special instructions that are given in the text. 

But it is difficult for everyone to be able to do exactly as is written in this text and I do not think it is even necessary to do that. And this is an important point to understand.

HH 17th Karmapa
Ogyen Trinley Dorje

From Torch of True Meaning Teaching, Jan 2017