Question about Professional Skills for missionaries:
"I want to be a missionary who does more than just medical or nursing care. How do I deal with the time constraints of a busy profession and still have a personal witness and assist in church planting?"
Also look at Mercy Ships. They see their healing ministry as a tool to aid in evangelism, not an end in itself.
Natural contact leads to invitations to your home. We used this "method" in our tentmaking years in Asia. Our home became mission central where many found the way to the Lord.