Beware: Newbie dumb question follows...

To upgrade my IBM Thinkpad 380Z laptop from NetBSD 1.5 to 
NetBSD 1.5.1 when it becomes available, will it require a 
total re-install, or will it be as neat and simple as 
"pkg add something"?

Thanks,
Gan Starling
Kalamazoo MI USA

Why I ask: I would be interested to upgrade NetBSD mainly 
on account of also wanting to install KDE 2.x supported 
under NetBSD 1.5.1 versus the current package KDE 1.2.1 
which is supported under NetBSD 1.5. This because CSS 
does not seem to be supported in the Navigator of KDE 
1.2.1.