I've got Kim's CD (invaluable), Bacon's book (well worth having on one's shelf and reading two to three times), the INOA Tech Digest (also a must have - though its "editted by committee" feel makes it harder to digest) and Mick Hemmings Engine Rebuild DVD (if you're going to do the engine - its so much easier to see things done than read about them - well worth the cash). I've also got the Clymer and Haynes manuals, which I only refer to in a hopeful, but usually fruitless attempt at seeing if something vague in the Norton Workshop Manual is better explained.
As for having a manual before the bike (or before you can spend a lot of time with a bike and the manual), I'd say its a bit futile. Well intentioned, but futile.
Norton's are pretty straightforward as machines. However, its hard to visualize so many of the procedures until you're up to your elbow in 'em. Even then, there's usually a lot of fiddling and cursing before your "Aha! Simple." moment occurs.
Let us know when you've got your ride. Plenty of helpful folks 'round here to ask questions of.