'Great Seal, The (Tibetan: Chagchen and Chagya chenpo, Sanskrit: Mahamudra): The Great Seal of realization. Buddha promised that this is the ultimate teaching. It is mainly taught in the Kagyu school and leads to a direct experience of the nature of mind.
The Great Seal encompasses the basis, way and goal.
With trust in one's buddha nature, one tries to rest in the inseparability of the experiencer, that which is being experienced, and the experience itself.
As a result, mind recognizes itself and seals its enlightenment.'
-- Quoted from 'The Way Things Are' book by Lama Ole Nydahl.
Blog author's comments.
Mahamudra is not a practice for beginners.
One has to take Refuge first, then go through Ngöndro, then participate in a Mahamudra course. Only then this practice can commence.