As that is a Swyama Siddha Hanuman Mantra it does not have being chanted for a fixed amount of Mantra Repetitions for being able to utilize it. Unique worship and rituals and guidelines concerning way, sitting mat, and counting rosary will not be proposed for chanting this Hanuman Mantra. The https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s