God's plan for enlarging His kingdom is so simple - one person telling another about the Savior. Yet we're busy and full of excuses. Just remember someone's eternal destiny is at stake. The joy you'll have when you meet that person in heaven will far exceed any discomfort you felt in sharing the gospel.
A man ceases to be a beginner in any given science and becomes a master in that science when he has learned that he is going to be a beginner all his life.