I'm probably not going to be much help but I put up pears each year in jars.
I use quarts, peel the pears with a peeler/corer. Cook them until almost soft in good apple juice. One year I didn't bath them and they all went bad, even though the pears were steaming hot when I put them in the jars.
My family and I eat these for supper, as part of our fruit/vegt.