I am Invisible!
Okay, the trick to being invisible is first the mindset.  You have to concentrate on NOT BEING THERE.
You are not there.  You are merely part of your surroundings.

This trick will not actually turn you invisible, physically, but it will turn you invisible mentally.  Other people will not notice you. 

Imagine a sphere of white light encircling you. 
It starts out bright.  Mold with it.  Become it. 
Slowly let it fade.  As it fades, you fade.  It blends into the surroundings and so do you.  You dissapear.  You are no longer there. 
Here's a catchy little chant you can say that may help you focus (by Silver RavenWolf):

"Dragon fog and chameleon sight
I command the shrouded sea.
I blend the mist, I mix the light
refract, around, behind me."
You are now, mentally, invisible. 
Amazing!
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