Start with disc number one of the install discs.
The Disk Utility may look different but will work much the same.
Don't be afraid to explore it, as long as you do not click on Apply or erase or commit then no harm done.
These install instructions are for newer versions but will work much the same.
For installing Tiger, Leopard and SL
Installing 10.4.x, 10.5.x and 10.6 is basically the same and have the same basic options.
There is the Erase and Install which totally wipes the hard drive and installs a new operating system and any additional software that comes with the installation disks that came with the machine.
If you are using a retail version of any OS X then it will include only the basics, no extras like iLife or iWork.
Getting ready to install means backing up any thing that you do not want to risk losing.
Repairing the hard drive with Disk Utility (on the installation DVD), these are done no matter the installation type (Archive and Install, Upgrade, or Erase and install), in the case of upgrade all Apple Software updates should also be done and then repairing the permissions before proceeding with the Upgrade.
Now on to the deed.
Start from the DVD with one of the ways listed above.
Here is a description of your choices.
Now select your language and click Continue.
At this screen will appear at the top a menu bar with different choices, Utilities being one of them.
If this is a new install on a new hard drive it will need to be formatted.
From Utilities select Disk Utility and then follow the below example.
If you wish more info click more information if not then Continue. Now select the destination you want to instal on (it may take a few minutes for all drives to appear, wait for them).
Some drives may have a yellow triangle with a !, that means that it can not be used to install to for some reason, such as wrong format or wrong partition scheme.
This can be fixed with Disk Utility in the menu bar under Utilities. PPC needs Apple Partition Map and Intel machines need GUID, they are not interchangeable. See above.
The other requirement is it has to be Mac OS Extended (Journaled) case on non case sensitive.
The default settings are.
1- If no OS is present then the installer chooses a first time OS install.
2- If there is a previous version then the installer will use Upgrade.
3- If there is a newer version of Mac OS X then it will choose Archive and install.
You can override the default by clicking on 'Options' on the destination screen as shown below.
The options are as follows.
To do an Archive and Install and save you user and network settings, then do the following.
After making your selections then click OK and that takes you back to the destination screen where you click on Continue.
Next is choosing which software packages are installed such as addition languages and fonts or just going with the easy install.
Now click on Done or Continue which ever starts the process.
DO NOT INTERRUPT THE INSTALLATION OR YOU MAY HAVE A HARD TIME RECOVERING.