"What is remarkable is that God spent days preparing with Peter, having him lodge with someone who works with unclean, dead animals, showing him visions, and talking to him. God let the six Jewish Christians at least witness the Holy Spirit falling upon Cornelius' household. But God turned the hearts of the Jewish Christians in Jerusalem so fast that they went from "contending" with Peter for dealing with Gentiles one moment to glorifying God for it the next. Prejudices deeply-ingrained over many centuries had been neutralized during a single conversation about the love of God being poured out on the lost."
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God will prepare the way for us if He calls us to do something whether sharing the Word with a friend or a stranger. All we have to do is to trust Him.