[Brian]

Happy to help, kray! Easiest thing to do here is use the "Back Up Database" item under the File menu. Save the backup someplace easy to get at, like the Desktop.

Once you've done that, just go ahead and re-organize to your hearts' content; if you don't like the changes at the end, you can select "Revert to Database Backup" (also in the File menu) and then revert to the state you saved earlier.