Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 1 year ago

You need to follow the witness of two of more of Ahlul Khubra أهل الخبرة 

Ahlul Khubra are the high standard of Ulama in the Hawza who know the level of knowledge of the Mujtahids and define who is the most knowledgeable among them.