Do It.
If you're going to unschool, do it now and do it well.
Part of doing it "well" is moving into it deliberately and with clarity, and going gradually, but by "gradually" I don't mean over five or ten years. Childhood lives in weeks, days and hours, not in months, years and decades.
but the quote is from page 20 of
The Big Book of Unschooling
photo by Megan Valnes