I would have to disagree with the throttle working the same on any size bike. So far I've ridden 250s, a 500 and a 900 and I assure you, the same twist of the throttle on a 250 isn't the same as on the 900. In fact, there's a huge difference between a 250 and a 500.
Not saying you can't learn on an 898, but I'd highly advise at least taking the MSF Basic RiderCourse first. Good luck!