[gentoo-user] Good 'layman' tutorial on IPv4 > IPv6?

[Tanstaafl]

I have a reasonable grasp of how to use IP addresses etc with IPv4, but 
every time I start rading about IPv6 I get a headache...

Does anyone know of a decent tutorial written specifically to those who 
have an ok (but not hugely in-depth) understanding of IPv4, and doesn't 
get bogged down in too many technical details, but simply explains what 
you need to know to be able to transition to it and use it effectively 
*and securely* - and/or how *not* to have to expose your entire private 
network to the world (what IPv4 NAT protects you from)?

Thanks...