Be authentic - people need to see and know that you are real!
DON'T USE CHRISTIAN JARGON
Instead of 'sin' try 'our mess/mistakes/wrongdoing', instead of 'saved' try 'being right with God.
HAVE YOUR STORY READY
Make the most of impromptu conversations. (1 Peter 3:15)
BE AWARE OF WHERE SOMEONE IS IN THEIR JOURNEY
They may not be ready to ask Jesus into their life yet but you'll be sowing a seed!
TAKE INTEREST IN THE PERSON
What is going on in their life? What is important to them?
DON'T WIN THE BATTLE WITH ARGUMENT
You are trying to breakdown barriers so that this person is closer to understanding that there is a God who loves them deeply.