Here's a few quick tips: ResEdit is capable of many disk operations. Select a file and choose Clear from the Edit menu; you can delete files from a disk. You can create New resource files by choosing it from the File menu, to stock your ICN#'s in, as well as FKEY's and the like. You get the idea.
OK... so I've opened the file Copy of Finder on the disk work disk to the level where I can get at the MENU resources and start changing things. Click on the Example #3 button to the right to see the next screen.
Do you see what's going on here? Each new window has the name of the item that preceded it, in a proper heirarchy reaching deeper into the files resources with each step. Neat, huh? I forgot to mention it earlier, but if you type the name of what you next want to open and press <RETURN>, it'll open the next window down just the same as double-clicking. Once you get into a resource and it's separate items are listed, you'll notice that each item has a unique ID number that makes it different from its fellows. I won't go into any more detail on resource ID's right now, but keep in mind that these numbers are EXTREMELY important; I'll explain futher on.
In addition, you can open more than one file with ResEdit, but for now, we'll stick with the MENUs. Changing these is EASY.