
I strongly recommend at least trying to go with the flow for homeschooling, for a couple of reasons:
Really just about the only mistake you can make with homeschooling a young child is to be too rigid. If something doesn't work well, you need to be able to shift gears. If you spend too much on curriculum and planning, you won't be as willing to dump it and do something different, even if that's the right thing to do. And that happens a lot the first year. Most people don't know what will actually work until they try a few things.
Plus if your child makes a big cognitive leap in a subject, he can skip past all the materials you have so carefully prepared. That's pretty frustrating!
Everyone is different, and you have to figure out what works for you. But "perfect plan" is definitely a phrase I'd suggest striking from your vocabulary!
Keep talking if it helps...