Our quince bush was full of quinces so we harvested them to make some jelly. We got a little over 5 pounds of quince. We used the instructions here http://simplyrecipes.com/recipes/quince_jelly/
Last year we made apple and quince jelly which was good - nice and sour. This year's should be even more sour without the apples. We had to throw away most of last year's because of mold but that was the first thing we had ever ever canned and we didn't have a proper rack or jar lifter or lid lifter so I'm sure they won't get moldy this time.