Islamic Laws : Following a mujtahid (Taqlid) » Taqlid: Following a Mujtahid
Fatawa of Ayatullah al Uzama Syed Ali al-Husaini Seestani
11. It is obligatory for a follower to learn the Masae'l which are of daily importance.
12. If a person faces a problem whose rule is not known to him, it is necessary for him to exercise precaution, or to follow a Mujtahid according to the conditions mentioned above. But if he cannot obtain the ruling of an A'lam Mujtahid on that matter, he is allowed to follow a non-A'lam Mujtahid, even if he has a general notion about the difference between the verdicts.