How do I upgrade from 4.0 to 5.0?

[Chris Ross <cross+netbsd%distal.com@localhost>]

  This really does seem like something I should know the answer to,  
but I wanted to check.  I looked in the on-line documentation,  
UPDATING, INSTALL, and other places I could think of, but I'm not sure  
I found enough information to feel comfortable.

  The typical system I use to upgrade systems is to install the new  
kernel, then reboot on the old userland, then install each of the  
other sets [I intend to load], and run postinstall with the etc set.

  However, with the change in kernel design, which I believe now  
includes loadable modules rather than all code being located in the  
single object, I want to make sure I know *how* to "install the kernel  
and reboot on the old userland".

  Is this documented somewhere that I missed?  Or, am I totally wrong  
in my thinking about what the process should be?

  Thanks much...

                      - Chris