This article from the DNA Genealogy blog absolutely rocks!!
I’ve tried this exercise out, taking it for a thorough spin…and it really does work.
The good peeps over at DNA Genealogy walk you through the process step by step. Please surf on over to http://www.geneticgenealogist.net/2016/04/how-to-compare-unrelated-people-on.html?m=1 to learn how to do it.