As difficult as you make it.
If you find the rhythm and style that best fits your family, it’ll be easy.
If you try to fit your family into someone else’s idea of what is “good homeschooling”, it’ll be much harder.
If homeschooling is hard for you, step back, reassess. Homeschooling shouldn’t hurt.
It’s a lot of work. It’s tiring. It takes a ton of brain power. But if it hurts, don’t bang that hammer so hard on your skull.