There are some good vies on YouTube also...
Cracklins are a real heritage food ( o.k....maybe not my heritage - but a heritage food nonetheless ) and harken from an era in which NOTHING was wasted. "everything but the oink" used. And, this we don't often consider it as such, how better to respect the animal, than to use all of it.
The last hog my Granny raised for food we took to a processor to break it down and my Granny said "you bring every piece of that hog back". We brought every piece back. She found a way to use every bit, tail, ears, head, tongue, skin, feet, intestines, all of it. When I asked her what she did with it all she said "I 'et everything but the squeal".