There is an abundance of documentation from the Project on installing OpenBSD.
The installation instructions that comes with OpenBSD is straight forward. Read the FAQ or the INSTALL.$ARCH file (for example INSTALL.amd64) relevant to your machine architecture.
If you’re video or image inclined, too adventurous (lazy) to follow the project documentation use your Search Engine and find other outdated, potentially hazardouse instructions.
Outlined here are installation items likely to be helpful for someone new to OS installations or has come from another Unix. For those really new to Unix I suggest you read the complete section you are interested in before attempting to follow the instructions.
TEXT Editing: If you are not familiar with using the vi text editor, learn. It is installed with the base installation of OpenBSD and although your favourite editor might be another few command-lines away, it is always useful to be able to administer your box(es) without having to install further tools on the machine.
Many administration tasks in Unix revolve around editing text files.
There is a real nice introductory, short, tutorial For People New to Both FreeBSD and Unix You should at least read through the tutorial for a guide to what you will do here (and reference.)
For the 1st time installer, I suggest either installing from a CD or by downloading the main installation files onto a local network machine or local hard-disk. Of course you can burn your own CD after downloading. Current OpenBSD mirrors will also have an install*$version*.iso that can be burned to a CD for installation.
For the 1st Time investigation into installing OpenBSD, you may be more interested in the general things a new user might come across, such as those previewed in First Time Installer and related topics always relevant when you don’t have the equipment, but wish to make some initial installation investigations:
The thing to remember, is to enjoy the new experience, and where possible, dig in and learn some more about the environment (whether it is the base Operating System, a specific tool you’re using, or the hardware.)
Build consistency assumes a decent level of experience with the operating system and services being installed. In this section of the notes are some basic installation issues surrounding a new OpenBSD install.