Farmers definitely still cultivate their own seed, even in the West, for cereal crops like wheat, oats, rye, and rice where hybrid and GMO variants do not exist

Farmers definitely still cultivate their own seed, even in the West, for cereal crops like wheat, oats, rye, and rice where hybrid and GMO variants do not exist or are not competitive. For these crops, it's not a very different skill. You just have to clean the seed and ideally test germination rates, though many farmers do not even do that.