As this is the Swyama Siddha Hanuman Mantra it does not have to be chanted for a fixed number of Mantra Repetitions for being able to use it. Specific worship and rituals and procedures about direction, sitting down mat, and counting rosary are not suggested for chanting this Hanuman Mantra. https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s