Stephen, a man fill of God's grace and power

Acts 6:8-15
Stephen, a man fill of God's grace and power, did great wonders and miraculous signs among the people.
Opposition arose to Stephen from Jews of Cyrene and Alexandria as well as the provinces of Cilicia and Asia. They argue with Stephen, but they could not stand up against his wisdom or the Spirit by whom he spoke.
They produced false witnesses to Stephen.
Stephan is charged with blasphemy and brought before the Jewish Council, just as Jesus was. He seems to have been among the first to foresee the inevitable break with Jewish worship which the new teaching entailed. He wants to 'altar the traditions Moses handed down' say his accusers.
Why?
Holy Spirit is with Stephen so he can speak bravely and without fear. He says the truth so no one could stand up against his wisdom or the Spirit.
What make me fear or afraid to preach gospel? I hope I can say the right word, but Holy Spirit man lead my tongue , I don't have to thinking what should I say.
How?
Doing work of the Lord need the Holy Spirit with me, it is working with the Lord,