You can look at the basic files by opening your eq2ui.xml file in the UIBuilder (make sure to copy it to a working directory like UI\Working before editting or you'll mes up your defaults.) Make sure you select MainHUD from the tab list on the preview pane to get the images to show. And yes, you'll either need to do it on your EQ2 machine or you'll need to copy your UI files to your work machine.
That will show you how things look, but to edit the actual graphics you'll need to start hacking at the DDS (that's the extension) files in UI\Default\images. The UIBuilder can tell you which ones to edit (SourceResource attribute) and which part of the file is assigned to what (SourceRect attribute.)
Hope that's a bit more clear.
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