I am by no means a social person. Small talk is an enemy of mine, as I am afraid I'll sound stupid or won't have anything useful to say. But I think we added to sales by stepping out of my comfort zone
One woman bought a hand embroidered (not by me) table runner, not because she had anywhere to put it but because she "loved the story behind it". A Ukrainian couple, while buying a few things, were genuinely pleased to hear me tell them that their homeland was a beautiful country (which I have had the privileged to visit). A man's kids bought a small trinket they might not have because they were waiting for him to stop talking to my sister and I about schools, the neighborhood and the weather.
I understand my Cousin's tips weren't meant for selling stuff at a garage sale, but when I hear great pieces of advice I like to use them wherever I can.
(In total I brought over three and a half loads of stuff to my sister's for the garage sale. Pictured is the second load and yes I am selling my Room and Board knock off bench, if you're local and interested please email me)