Whenever a Belvaspata protocol is specifically designed for the practitioner's personal use (such as awakening intuitive abilities within) then anyone can use it. Using the same Belvaspata protocol on someone else, should be done by a Belvaspata practitioner unless clearly stated otherwise.
This doesn't mean that any Belvaspata protocol done on oneself doesn't need to be done by a Belvaspata practitioner — only those protocols meant to awaken inner qualities by doing it oneself. In other words, if you practice Belvaspata on yourself (with a protocol that is designed for that) you don't have to be initiated.
But there are so many protocols that an initiation would enable you to do for loved ones, to strengthen their immune system, etc. (especially because of viruses abounding) that it's highly recommended that all students of the work set aside a day and get initiated.
What happens if an uninitiated person does Belvaspata on someone? It brings chaotic circumstances into his or her life and could overburden their physical excretionary pathways, causing a healing crises