FreeBSD portupgrade of 8.1 -> 8.2

I've got 8.1 running fine.  I want to upgrade to 8.2.  Problem is,
FreeBSD's portupgrade utility only wants to upgrade my existing 8.1
installation.

So I grabbed the latest ports collection, which includes
postgresql82-client and postgresql82-server.  Running 'make install' on
postgresql82-client gives me:

===>  Installing for postgresql-client-8.2.5_1

===>  postgresql-client-8.2.5_1 conflicts with installed package(s):
       postgresql-client-8.1.10

       They install files into the same place.
       Please remove them first with pkg_delete(1).
*** Error code 1

So I ran: pkg_delete postgresql-client-8.1.10

... and got this error:

pkg_delete: package 'postgresql-client-8.1.10' is required by these
other packages
and may not be deinstalled:
dovecot-1.0.0
kde-3.5.6_1
koffice-1.6.2_3,2
php5-extensions-1.1
php5-pgsql-5.2.3
postgresql-libpqxx-2.6.9
postgresql-plperl-8.1.9
postgresql-server-8.1.10_2

I seem to have hit a brick wall.  I tried installing postgresql82-server
first but it wouldn't do that without the 8.2 client library installed.

What's the portupgrade process in FreeBSD??