The same question is asked over again and again, how can we tell who is genuine practitioner? The answer is very simple: anyone who likes to boast his or her images, knowledge and claims to have magical powers, clearly shows all the wrong sighs.
There are two sighs one can study, first, who is very humble and calm, even though who had acquired wisdom and knowledge.
Second, who lacks poisons, such as a ignorance, hatred and attachment to great levels.
Rest are all ordinary and that also means you need to work hard.