some things are (nearly) universal. Wildy told many stories while I was with him all last summer.
One of them was going out to California branch of family, in early 1920s I think, and being tasked to help with the hog butchery. He'd been helping for years in Nebraska, but the CA people didn't have corn cobs handy to plug up back end. They used tree branch instead.

Rest of your description pretty much follows his.....including the boiling water, hair scraping (done by kids in Nebraska) and the extraction of lard and chitlins.

Now you know what the term "hog tied" refers to.