200# hog will need about 600# of feed so I would have to grow about 20 bushel of corn-with old technologies, that would be 1/2 acre.....I’d better get started digging.....
We grew 2 acres of corn using old techniques, plow horses and hoes. The corn went to feed hogs, the plow horses, and a milk cow. A tiny part was ground for cornmeal, practically all went to feed the animals. With five kids a milk cow was a necessity. The chickens pretty much fed themselves but with snow on the ground we'd shell some corn for them. Between shelling corn for the chickens, milk cow, and horses we had plenty of corn cobs. In those situations you don't do what you want to do, you do what you have to do. Romance meets reality really quickly.
Don't start digging, start looking for a turning plow, double-shovel, triple-foot, a wagon (got to have a wagon), mowing machine, and hay rake. You can probably barter for horseshoes and nails but learn to shoe a horse. Build a hay barn with a corn crib as part of it. Learn how to build mouse traps if you want to keep any corn. In addition to hoes for every family member you need an ax, mattock, pick, wedges to split wood, a sledge hammer, shovel, scythe, sickle, pitchforks, and small tools like saws, hammers, pliers, and wrenches. Even then being self-sufficient took a lot of tools and equipment, some powered by horses, some powered by you.
Dad had about 75 acres. probably 5 of those were woods, he had about 7 or 8 acres flat enough to plow and usually had just under three acres in crops, rotated them around. A fair amount was hay fields but a lot was too steep for anything except pasture, which was kept cleared. His cash crops were about 8 cows to sell the calves and he raised about a ton of tobacco each year.
Dad was able to stay self-sufficient until the mid 1950's, but times changed after the war and he finally got a factory job. He still kept up with most of the farm at night and weekends but fence rows started growing up and some things changed. One thing that did not change was that extended family helped family and neighbors helped neighbors. At least there.