track current kernel

[itti]

Hi,
I am a long time linux user and i figure out i should give netbsd a
try. I downloaded NetBSD 4.0 installed it on my system. I read
http://www.netbsd.org/docs/current/
but it's not so well structured for my taste I just can't figure out a
few things.

I want to test the latest kernel (current) so i get it through anoncvs
(equivalent as taking the linux source with git i'm not lost here
:P). Now do I have to get anything else on a fresh installed NetBSD4.0
to compile and use the current kernel just for testing?
There are a lot of informations on that site i just can't figure out
which one to follow.

I don't want my whole system current just want to get the current
kernel compile it and put it along with the one i have so i can chose
to run it.

So please help a confused young netbsd user.
Thanks