I'm having a hard time finding info about pulling the kids out DURING the year. HELP!
I'm in VA...
Seems the same there as here in KY, just send in the notice of intent. They just need it processed before they're start worrying about lack of attendance, usually within 2 weeks of pulling out. To be kind and not stir up trouble and bad feelings I did it all in a week, first told the teacher, then submit the paperwork to the district, then informed the school office, then didn't bring him back the next Monday. I did look into Virginia homeschooling as I want to move there in a couple years. You are supposed to keep records of studies and school days, and a portfolio of work I think. If not using religious exemption for end of year evaluations you'll have options: testing, teacher certification, or portfolio review.
As soon as I gave notice to the superintendent's office, my kids were officially not enrolled any longer. I went directly to the superintendent's office to hand them my letter of intent in person on their first day out of school which meant they had it immediately. I had also let the school know in advance what our plans were but just did the "official paperwork" on that first day not attending. I had also waited for a semester break/Christmas break.
We're also in KY where it is simple.