Thanks! I leave for Japan for 3 weeks on Saturday, so this was very helpful.
I've read tons of Japanese 'etiquette' guides, but they don't usually cover everyday stuff.
One thing though - is the train system as complicated as it seems? This is probably the thing I'm most nervous about. I mean, I'm sure I'll get the hang of it eventually, but I confuse easily so hopefully it won't be too problematic!