Look for people who can state your own position as well (or better) than you can, and yet still disagree with your conclusion. They may be aware of additional information that you are not yet aware of.
In addition, if someone who knows more than you about a subject in which you disagree, also has views about several other areas that you do know lots about, and their arguments in those other areas are generally constructive and well balanced, pay close attention to them.
Look for people who can state your own position as well (or better) than you can, and yet still disagree with your conclusion. They may be aware of additional information that you are not yet aware of.
In addition, if someone who knows more than you about a subject in which you disagree, also has views about several other areas that you do know lots about, and their arguments in those other areas are generally constructive and well balanced, pay close attention to them.