We did it on my income alone. Finished HS 5 yrs ago. Lowered our expectations of lifestyle. You have to be able to accept that there will be things that you will need to put off, at least until the kids are done with school. But after 18 yrs of homeschooling, you learn to live a simpler lifestyle. Still do.
We did, too.
But you can save a lot of money without the expenses the second income generate in the form of extra gas usage, clothes for work and last, convenience food for the nights you’re too tired to cook, but far from least, child care.
And that’s just a a start.