A:
It is not permissible for anyone other than those who are well versed in religious knowledge to practice Da`wah and teaching. Allah (Exalted be He) says:
Say (O Muhammad صلى الله عليه و سلم): "This is my way; I invite unto Allâh (i.e. to the Oneness of Allâh - Islâmic Monotheism) with sure knowledge
Furthermore, whenever danger is expected, they are exempted from this duty. Allah (Exalted be He) says:
So keep your duty to Allâh and fear Him as much as you can
He (Exalted be He) also says:
...and do not throw yourselves into destruction
(Part No. 12; Page No. 117) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.