upgrading ipfilter or pfil on Solaris 10?

Gang,

While I'm the author of the how-to on replacing Sun's ipfilter
with the public domain version at:

http://www.colby.edu/personal/j/jaea...filter.upgrade

I have never upgraded ipfilter or pfil from one version to another
on any of my Solaris 10 boxes. I need to do so. Anybody have
any advice, warnings, or gotchas on this topic? Or is this new
territory that needs to be documented?

Jeff Earickson
Colby College