If Jesus is in your heart he will come out of your mouth. Go ahead, and don't be afraid tell people how you found the Lord, and what God did for you. Evangelism is very serious work, not to be taken lightly. Some seek to be Evangelists, Because they see some of them preaching in the pulpit, getting the spotlight. Or perhaps for other selfish reasons, instead of a burden for the lost.
Evangelists have many other duties and obligations.