If I recall, get some plywood & stretch it out over that & heavily salt it for maybe 3-7 days, then get to work scraping all the flesh & fat off. Then you soar it in a 5 gallon bucket of water with some mixture of canning & pickling salt, alum & something else for several days. Then you let it hang dry & periodically stretch, ball up, wring out, knead, basically work it then you're done.