here are some notes I took while installing OpenBSD.
It took a few tries, so I kept a handy list of commands
in the order they need to go.

in disklabel:

d a
a a
  size 128M   /
a b
  size 512M   [swap]
a d
  size 256M   /tmp
a e
  size 128M   /var
a g
  size 1024M  /usr
a h
  size *      /home

boot hd0a:/bsd

# check date/time
date 200203172143

#update updatedb :)
/usr/libexec/locate.updatedb &

#get emacs
pkg_add -v ftp://ftp.openbsd.org/pub/OpenBSD/3.0/packages/i386/emacs-20.7-no_x11.tgz

#add users
groupadd -g 500 cool
useradd -g cool -m eo
passwd eo

#get source

setenv CVSROOT anoncvs@anoncvs.usa.openbsd.org:/cvs

# get the patch branch
#quiet
cd /usr; cvs -q get -rOPENBSD_3_0 -P src

#verbose
cd /usr; cvs get -rOPENBSD_3_0 -P src

# then update the patch brach for 3.0
cd /usr; cvs up -rOPENBSD_3_0 -Pd

# customize & compile a kernel
< see intrux >

# add other DNS servers in /etc/resolv.conf
<use emacs>

# create second ethernet interface; set to internal IP
cat >> /etc/hostname.fxp1 
inet 10.0.0.20 255.255.255.0 NONE
^D

# add new host entry for internal IP to /etc/hosts
# also fix hosts file due to install bug in 3.0
127.0.0.1 localhost
192.168.1.20 fw.cnc.com fw
10.0.0.20 int.cnc.com int

# turn on pf
in /etc/rc.conf
  pf=YES
  
in /etc/sysctl.conf
  net.inet.ip.forwarding=1

# start'er up
sh /etc/netstart

# reboot
reboot

# then run patches for all errata
...