Many try to pursue this The knowledge in books is limited. It never talks about technique. Just gives results or interpretation and results by variations in breath
The technique has to be learnt and one has to have full mastery over many shakti.
That is why it is called shiv swarodaya. Shiv indicating mastery.
I will spare writing the secretes. It has to be learnt with much humility at the feet of the guru
It is a complex interplay of shaktis, tatwas and prana
Bhavin