Simple rules to guide you through life:

If
in doubt, don’t.  Doubt is your safety net telling you it’s not a good time to jump.
Believe it.  Don’t be like the redneck
whose last words were, “Watch this!”

Believe
none of what you hear & only half of what you see.  Hearsay is generally disallowed in court for
a reason, and with today’s technological advances in the manipulation &
falsification of images, half may be too generous an allowance.

If
you have to choose between multiple versions of an event, always believe the
one where people are at their worst.  Human nature is, after all, human nature, and
it has been worsening of late.

When
someone often says “To tell you the truth” they’re probably not.  This is particularly applicable if they are
trying to sell you something. 

Trust
first impressions.  You have developed instincts during your life that are based upon
valuable experience. This is where your brain & your gut work together for
your benefit.