The apex of Tantric practices and very, very effective…

…and very challenging. You really need empowerment into this practice and guidance from experienced Tantric.

Books on the subject of Chöd:

Machik’s Complete Explanation: Clarifying the Meaning of Chöd
https://www.amazon.co.uk/Machiks-Complete-Explanation-Clarifying-Foundation/dp/1559394145/

Chöd: the Sacred Teachings on Severance: Essential Teachings of the Eight Practice Lineages of Tibet
https://www.amazon.co.uk/Chod-Teachings-Severance-Essential-Practice/dp/1611803721/

Machig Labdron and the Foundations of Chöd
https://www.amazon.co.uk/Machig-Labdron-Foundations-Chod-Jerome/dp/1559390395/

Chöd Practice Manual and Commentary
https://www.amazon.co.uk/Practice-Manual-Commentary-Thekchok-Dorje/dp/1559392673/