I've not made no sugar jellies/jams, BUT I have made very low sugar ones using Pomona's Universal Pectin. It is fabulous!!
here's their website:
http://www.pomonapectin.com/
It costs MUCH less to order it in bulk. But believe me, one 1 ounce box will do several batches of jelly/jam. and I've never processed them other than to boil, and pour into hot, sterilized jars and sealed.
You CAN make no sugar jellies/jams with Pomona's.....forgot to say that the first time. : )