As a final comment, studying the information in
Section 4 of the FAQ is also paramount to understanding the install process. Upgrading is nominally discussed there as well.
There is a wealth of information to be found in both the FAQ & Upgrade Guides. Studying these beforehand with alleviate aggravation & prevent blunders. Many of the questions/situations we deal with here are from those that don't take the time to understand the information contained.