I have been wondering about this as well! While reading a book, I found a pamphlet published in 1967 with this prayer tucked into the pages. The pamphlet is titled “Prayer against Satan and the Rebellious Angels.” Below the title it says, “Published by order of H. H. Pope Leo XIII.” It includes a prayer to St. Michael, followed by a long prayer of exorcism. The prayer of exorcism has a footnote that reads, “Lay people omit this parenthesis.” The portion to be omitted by layity is said by a priest.
I have found conflicting answers about wether or not lay people can say this prayer (omitting, of course the portion said by a priest). Some of what I’ve come across says in no uncertain terms that layity are not to say this prayer. Other sources basically say individuals may say the prayer, but that it’s not to be used in a formal manner. I recall reading something about deliverence ministries crossing the line with this years ago, thus prompting some type of directive regarding the use of this particular prayer and exorcism. I will see if I can find the information again.
I asked my priest about it, and he wasn’t familiar with the prayer. His said that if layity were once encouraged to say it, he didn’t see any reason why it wouldn’t be ok now. I said the prayer once, right after finding it, but have refrained from saying it due to the conflicting information I’ve found. The demonic are quite aware of authority, and I want to make sure I have proper authority before continuing to say this beautiful prayer.
As a side note, I read that this prayer is to be recited while standing. I’ll see if I can locate the info. I found before about it, and I’ll share it with you.