Getting a head start will benefit you exponentially.

My wife and I were talking about homeschooling, and she mentioned to me how if she started homeschooling at our oldest's current grade (7th), it would be a lot harder since the subject intensity is just at another level.

When you start early from Pre-K, you can also learn the information along with your child, making it easier for you to digest the material and concepts.

Remember, you will only have to learn the material from scratch once.

Each subsequent child will learn the same subjects from you, but since you have already taught the subject before, it will come back fast.

The only thing that gets challenging is managing more kids.

The material is not the issue.

Start them while they're young, and while you have less of a hill to climb.