Paul states that the gospel he presents is not of his own but from Jesus Christ. He was a zealous Pharisee and tried to destroy the church which proclaimed Christ. God called Paul through his grace and revealed Christ to Him that he might preach Him among the Gentiles. He did not speak to others about it immediately nor go to Jerusalem to the apostles who were already preaching the gospel of Christ but rather went to Arabia and returned back to Damascus.
1) The gospel is not man's handiwork but from Christ.
2) An encounter/experience with Christ is needed to have conviction in what you believe.
3) God can work through you no matter who you are as long as you allow Him.
4) God may call us to a different people/calling then we may imagine.
When we think of evangelism we must include God. Allow room for the working of the Holy Spirit. We have plans but we must bring them to God.
This is particularly more true for 2nd generation Christians. More often that not, the experience will not be as dramatic as Paul. But God works in ways beyond which we can ask or imagine. We can experience Him in different ways. A relationship with him would be essential for that experience.
For the many mistakes we make, we feel that we are beyond redemption. But God can work with us as long as we surrender our lives to Him. A complete surrender is necessary for God to work effectively though.
Sometimes we may expect God to use us in a certain ministry, to a certain people. But it doesn't always work out the way we expect. We should leave room for God to work with even though the calling may not seem to be part of your interest or talents. God can work through us as long as we have a willing heart.