an individual who assists in a assigned field without the qualifications of a professional

Answer 1

The key word I see in your statement is "assists". Assuming one has the practical experience to "assist" and the best interest of the student in mind, it could be a mutually beneficial arrangement. If by "qualifications" you mean a specific degree and or certification, it really depends on the "assigned field" to which you are referring and the level of complexity of the question or issue at hand.