Replacing PPU

Miscellaneous Forums/General Discussion/Replacing PPU

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Edit: PSU*

Is replacing a PPU difficult or is it something I can do on my own? I ask because I'm getting a new graphics card (Radeon X1950 Pro) soon that requires at least a 450W PPU, but I've got a 400W one.
I took a look in my case and it seems rather complicated. There are hundreds of wires all bunched together, going to different places. Is it a matter of remembering what goes where?

Another thing: Under the specifications for the graphics card, it says I need a PCI Express compliant PPU and a direct feed to the PPU. Is this wire included with the PPU or the graphics card?

Here's the PPU I'm thinking of getting: http://www.compusmart.com/Product/Default.aspx?SupplierPartNo=227605
It's 600W for the same price of 500W for some reason.