I think the best approach is NO "preparation." By keeping your child intact, you are not doing anything "weird." IMO, it's those who circ that are doing something weird. :LOL
Of course, I don't generally talk about my childrens' genitals with ANYONE (maybe our doctor, if there is a problem, but there hasn't been). I also don't change diapers in front of other people; it just makes me uncomfortable and makes me feel like I'm not respecting my child's privacy. I don't go to the bathroom, take a bath/shower, or otherwise get naked in front of extended family or friends, so I don't do any of those things to my child in front of extended family or friends. Maybe I have issues, but that's how I feel. :LOL
The only person who changes our children's diapers besides DH and me is MIL. She and FIL are the only ones who babysit, so he OCCASIONALLY changes diapers. But mainly it's just her who does it. Since I breastfeed exclusively, I don't leave my kids with them until at least a year old. So if I ever have a boy, I don't see the need to talk about the care of an intact penis until at least that point, as DH and I do all the diaper-changing.