Here is a quick video by a street photographer. Not a portraitist, but a photographer who chronicles street culture. He speaks about getting into a different mind frame, a different dimension, something with which I can identify. A lot.
I try to enter a different dimension when approaching strangers. Remembering gratitude, being thankful for everything around me helps to get into this dimension.
This video is less than three minutes. If it does not play on your computer, the link is HERE.
Enjoy, and have a nice Sunday.