I refuse to answer the door. I check to see who is outside, if I do not recognize the person, I do not answer the door, especially since I am at home alone a lot! I will let DH answer the door when he is home to deal with them.
Since I am not a trusting soul and know how many breakins there have been, I keep an eye on the person and make sure they actually leave my yard and I watch where they are going. We get a lot of people selling everything from cookies to home improvement, to water quality, not to mention the politicians and religious canvasers.