During this time I've had a growing sense of purpose, peace, and fulfillment based on my personal relationship with Jesus Christ, not based on my successes in life. Do not preach. Leave your audience with a challenging thought. Keep in mind that they will generally comment on the last thing you say. Avoid tacking a Scripture verse onto the end.
Some Helpful Hints Do consider writing more than one draft.
Do rehearse your testimony until you are able to give it naturally. Don't use Christian lingo. Words or phrases familiar to a Christian may be strange or nonsensical to a non-Christian. Don't be too wordy. Have a clear point and direction to your words.