One of the common threads that I've noticed running through the testimonies of the great preachers and leaders, is that most had a very humble beginning. They never set out to become world famous preachers or leaders. Their hearts were focused on Jesus and He taught them along the way by preparing them with one task at a time. Their fame didn't come overnight, although a few were transformed by having their feet put to the fire. It was a simple step by step process where each step built upon the last. They completely surrendered their life to Jesus, emptied themselves so that He could remake them into the image that He desired for them. They were examples of God's Word coming to life. They waited on God to move them and they followed the promptings of the Holy Spirit. Surrender and give Him the power to do a good work in you. You never know the kind of impact a small task may have.
"One who is faithful in a very little is also faithful in much, and one who is dishonest in a very little is also dishonest in much. Luke 16:10