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.
Part of my training was learning how to refer patients to cardiologists for heart problems gastroenterologists for stomach issues and rheumatologists for joint pain. Given that most physicians were trained this way it's no wonder that the average Medicare patient has six doctors and is on five different medications.