Here is a guide to installing SQL Server 2008 or SQL 2008 R2. It merely contains 30 screen shots that you would encounter during the installation. This is geared toward a full installation, and helpful for non-SQL-savvy professionals who are doing this installation for the first time.
SQL 2008 R2 Installation Guide
(this is a pdf document you can save)
Some of the options can be intimidating, but know that all of the paths and user account options can be changed after installation, so you don't need to fret about having a perfect configuration from the start.
Hope this is helpful to you!
- Paul