How do you know if someone is a narcissist.?

how would u help a narcissist. I guess a friend of mine is a narcissist. How could i help her.How do you know if someone is a narcissist.?
At smallest five of the following are necessary for a diagnosis (as beside many DSM diagnoses, they must form a pervasive model; for example, a person who shows these criteria with the sole purpose in one or two relationships or situations would not properly be diagnosed beside NPD):
has a grandiose sense of affectedness
is preoccupied with fantasies of unlimited nouns, power, brilliance, beauty, or just the thing love
believes that he or she is "special" and unique and can individual be understood by other special nation
requires excessive admiration
strong sense of entitlement
take advantage of others to pull off his or her own ends
lacks empathy
is often envious or believes others are envious of him or her
arrogant affect.
In the first five minutes of conversation, you'll find out, as they will constantly use any "I" or "ME". They can't be helped until they take that they are narcissistic. Then just if they wish to be help.
If they taking a lot of their pitcure