Al Salamu 'Alaykum.
Shaykh Salih ibn al 'Uthaymin (rah) writes in his book, "Al Usul min 'ilm al-Usul" in the chapter on taqlid:
"Taqlid takes place in two places; the first is that the person doing taqlid be a layman, incapable of discerning the ruling by himself, so his duty (Farduhu) is to do taqlid due to the statement of Allah (swt): "Ask the people of Remembrance if you know not (Sura al Nahl:43)." p.68.
In his recorded lectures of this same text, Ibn 'Uthaymin adds that for the average Muslim to try to delve into the Holy Qur`an and Sunna in order to deduce rulings is like a person who has not learnt swimming trying to swim at sea. It will only lead to his destruction.
Taken from "Understanding Taqlid: Following one of the four great Imams" by Mufti Muhammad Sajaad, pg. 45.