Hi,
I've read the documentation at http://netbsd.org/Documentation/current/ perhaps i'm again not sure to do all points correctly...
I've install netbsd 1.5.2 and i haven't nothing in /usr/src
so i've try to update with the follows commands:
setenv CVSROOT :pserver:anoncvs@anoncvs.netbsd.org:/cvsrootcd
cd /usr
cvs login 
password: anoncvs
cvs checkout -rnetbsd-1-6 -PA src

After that i must do anything else ? Or i can compile immediatly compile the  kernel?
Thank you for yours answers :)