We pulled our kids from a private school for this year. I have a PK4, 1st and 3rd. We love using the trivium. For much of our stuff (especially science and history), we do memory work from CC. We did join a community but you could do it on your own. Every age and learning style can do memory work in their own way so it's been great.
Everyone does hands on stuff together.
For the 3rd grader, we reinforce it with more formal ways (independent reading and writing and research), and he does Latin.
For the 1st, more age appropriate copywork or visuals or coloring.
The PK4 is just along for the ride.
We have separate math and LA curriculum.