Need to partition current internal drive first...help needed

Hello, I'm currently installing a version of leopard on my macbook pro intel 2 core duo. Problem is I had previously swapped out the hard drive for a 320 and failed to partition it as a GUID so the leopard installation is saying that needs to be done first. Fine, I'm backing up all my files and will be doing that. My question is if I go into disk utility and re-format the drive, it won't have an operating system on it so how do I boot from the disk. I mean at what point do I put the disk in and hold down 'C'. Will it turn on without an operating system installed. Or do I put the disk in first, then re-format the drive and restart or something? Otherwise I think I may be able to put in the leopard disk and have it re-format the drive for me, but I don't remember that being an option.

You cannot partition the startup drive unless you boot from another device such as the OS X Installer Disc that came with your computer or a retail Leopard DVD that installs a version later than the one that came with the computer (if it came with Leopard pre-installed.) Here's what you do:
Extended Hard Drive Preparation
1. Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger or Leopard.)
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Set the number of partitions from the dropdown menu (use 1 partition unless you wish to make more.) Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID (only required for Intel Macs) then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
After formatting has completed quit DU and return to the installer. Complete the OS X installation.
Booting From An OS X Installer Disc
1. Insert OS X Installer Disc into the optical drive.
2. Restart the computer.
3. Immediately after the chime press and hold down the "C" key.
4. Release the key when the spinning gear below the dark gray Apple logo appears.
5. Wait for installer to finish loading.

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    cable select IDE has a little sliver cut from a
    segment of the ribbon that makes the driver CS no
    matter what the jumper setting.
    I have no idea why this worked but it did. I have
    not had a problem since.
    Thanks, but I'm a little confused. So a new cable for each drive or are there doubles? Is this a universal cable Mac/pc? Maybe the cable that came with the drive (that I probably threw away)? Do you know the link of a supplier? Would any Apple store have these??
    Knowing why this worked would relieve a little anxiety. Do these cables go bad just sitting in the cpu?
    Anyway I googled PATA and I'm still not sure if I'd know the difference between a cable select and a non CS. I'll continue my research.
    Thanks again!
    Hmmm, swapping the drives. Maybe I'll try this before I swap the cables.
    Thanks,
    G4/1.0 DP MDD Mac OS X (10.4.7)

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