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I changed the chain and sprox on mine last week. As my wife wasn't able to help, I was expecting an epic battle with the gearbox sprocket nut, involving a game of Twister with brake pedal, but it was a lot easier than I anticipated. Someone on a forum suggested putting the bike in gear and putting the front wheel against a wall (why did I never think of that before?) and with a 24" breaker bar it came off pretty easily. It's only torqued to 120NM, which is tight but not stupid tight.
One tip from past experience: use a drift or punch and make sure the retaining washer is absolutely 100% flat against the sprocket before you try to turn it. Even the slightest proudness of the washer will turn difficult into impossible.
And yes, it is a normal right-hand thread.
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