Similarly to others, we just started saying we were thinking of/considering/looking into the idea of homeschooling whenever it came up. Our families know us (me) as the odd-ball, though, so we actually got asked if we were going to send our child to school - as if the default in their minds was that we would choose homeschool. heehee
But one thing I have definitely picked up from the experience of talking with other parents (with kids who already attend or who will likely attend public or private school - including our own parents!) is to avoid criticizing public schools. In every situation I've ever done this, the other parent responded with defensiveness (though most often cloaked to be polite). However, when we discuss how our CHILD would do better in a home learning atmosphere because HE has X, Y, Z characteristics/issues, then it comes across as more respectful to the other parent(s) and there is more back-and-forth discussion rather than argument. I think it gives them an "out" or a way to save face. From their perspective, you might come across as though you think you are a better parent. It's a common theme in many discussions of non-mainstream parenting choices, unfortunately, but stick to the subject of your kid & it should prevent at least that headache. :)
edited to add: Oh and about the hype/dissappointment issue: Riding the school bus was a biggie around here. Even though he has made it clear he does not want to go to Kindergarten next year, he was still absolutely pumped about riding the school bus. I told him we would make a cardboard school bus to use -- showed him pictures of insprations (costumes online) -- and he is quite fine with that. I don't even think we'll have to drag it out everyday, as he will undoubtedly loose interest. For other things, I think there is so much opportunity to hype up homeschool that he won't really care about what he's "missing."
Edited by user_name - 5/17/11 at 3:47pm