As this is the Swyama Siddha Hanuman Mantra it does not have to generally be chanted for a fixed range of Mantra Repetitions for being able to use it. Special worship and rituals and regulations pertaining to direction, sitting mat, and counting rosary are certainly not encouraged for chanting this https://wodirectory.com/listings13063100/how-much-you-need-to-expect-you-ll-pay-for-a-good-hanuman-shabar-mantra-get-rid-of-all-problems