Unfortunately many traditional Christians do not have priests who can guide them in Hesychasm, however, my understanding is that just saying the Jesus Prayer frequently with or without a prayer rope is universally thought to be harmless (I am basing this on Metropolitan Kallistos Ware and various other writers, especially St. Ignatius Brianchaninov).
According to Kallistos Ware its the more intense monastic form of Hesychasm which can feature breathing techniques et cetera that really should not be attempted outside of a monastery.
Fortunately Roman Catholics can access information on Hesychasm and get a prayer rule from Eastern Catholic clergy, because even if one is Roman Rite, one can go to an Eastern Catholic liturgy or monastery.
The Anglicans also used the Jesus Prayer when implementing their Anglican Rosary.
So just to be clear
@GreekOrthodox I am not disagreeing with you; ideally people would have an Orthodox priest with knowledge of Hesychasm, which sadly a great many of them lack, indeed, there are even a number of monasteries without Hesychasm, and it has nearly died off a few times, only to be saved by dedicated men of prayer, most recently I believe the generation of Elder Panteleimon and Elder Joseph on Mount Athos in the early 20th century. And it had also almost died when St. Nicodemus the Hagiorite and St. Macarius of Corinth worked to revive it and published the
Philokalia as, among other things, a guidebook. But to do full on Hesychasm in spiritual health, an Eastern or Oriental Orthodox confessor, usually monastic (in the OO community, I think most hesychasm is happening in Coptic monasteries, where it was bolstered by Fr. Lazarus el Antony, the Australian anchorite who lives in a cave near the Cave of St. Anthony, where he liturgizes nightly). Fr. Lazarus began his monastic career as a novice in a Serbian Orthodox monastery in Australia, which, to the credit of the Orthodox Church, was the only one willing to accept a non-member who had been an atheist, who had come to believe in Christ and wanted to convert and become a monk right off the street.
However, I don’t think it would have anything other than positive effects if people learned to say the Jesus prayer and said it frequently. And doing that really isn’t Hesychasm, its just saying the Jesus Prayer.