To partition your drive, you would boot off your Tiger disc by holding the C key down.
Choose your Language on the first screen.
Go up to the Utility Menu to Disk Utility.
Click your hard drive, then the erase tab. You'll see the commands.
Doing this will completely erase the drive.
Partitioning is an individual preference. Some people like having partitions, some don't.
It is safe, but usually not necessary.