MAN-UP HANNAH!!!!!!!!!!

I am currently very much in 2 minds as to whether I can do this!
Ok, I can deal with living in a different country, I've been before and I realise I will probably be the only foreigner wherever I am but it's not like being stared at for being different is a new thing. And the language barrier can be resolved with a phrase book and probably some pretty wild gesticulations.
No, my main issue is the actual teaching. I've been doing some research, looking at people's blogs etc and I have officially terrified myself! My overall view is that the teaching system in Japan is very different to how it is here and teachers don't seem to have half the support they get here. I've read blogs where the ALT basically just stands there and occasionally hosts a game, holds a card and is used for pronunciation but then I've read other blogs where the the English Teacher is harrassed by all the kids and has no help at all from the native teachers. I'd be happy with scenario 1, I don't particularly want a lot of responsibility. I know at our interview the Interac rep there said that we'd be team teaching with the JTE at the school and that they would handle discipline etc and I really hope that's true.
I know that here no-one would ever be allowed to teach an entire class on their own with just a certificate and 3-day course but I'm not sure that's the case over there.

I may be getting over stressed. I imagine for every blog I've read there are hundreds who have had an entirely lovely experience and I really hope that I can rise to the challenge of becoming more of an assertive person to survive but I suppose at least I know the common pitfalls I'm likely to face.

I'm meeting my friend this week who has been teaching abroad for a good few years now (and will also be in Japan when I am,hopefully) so I'm hoping that she can sort me out! I figure it can't be hideous if people can do it for so long but then again, maybe they're different sorts of people?

I will kick myself if I don't do this, and I'm not sure what I'll do with my life if I don't but at the moment reality is hitting hard!