The only snag I've hit so far, and it's a big one, is that my old scanner and printer aren't supported by the latest Mac software. Curses! (They're an Epson Perfection 1200 Photo and an A3 Epson Stylus Photo 1290.) They are so, so good, this is such a hideous waste! Grrr.
Well, I guess I'll have to decide if I get another A4 scanner or upgrade to an A3, and figure out what's a decent A3 printer. I'm partial to Epson, but I could be persuaded otherwise. Let me know if you have any recommendations!
Edit: I've got them both working now, thanks SO much for your help! xx