Are first impressions trustworth2

Are first impressions trustworthy?
Human nature is a complex thing. Therefore it is impossible to
state that one way to judge person`s character is better than the
other. Everyone should their best way. I have experienced that both
approaches are right sometimes.
First impression about other person is based on many hidden
intrinsic psychological factors and past experiences, that we are
not even conscious of. The experience with other people has
settled into our minds and it is sometimes causing a right
decision. Latter analysis may even lead us to the wrong
direction.
On the other hand, most of the people know about the importance
of the first impression and they are trying to act accordingly. First
impression may even be lead by many unimportant details like
clothing, perfume etc. Therefore quick judgment may be unrealistic
and fake. It is always good to spend more time with the person
before the decision, because it is very hard to fake for a long time.
I have been led by wrong first impression, because the person
looked untreatable. After I got to know him better he turned out to
be a decent man and he is one of my best friends now.
I have also tried to ignore my negative first impression about a
coworker and tried to believe in him. Although my belief even
changed him to be better, we had to fire him finally.
My conclusion is that there is no one right way to judge person`s
character, that skill is personal and must come with experience.