basically you should first learn how to ride a bike. it will not take much time if you have the basic idea of what to do. you already ride activa so you have balance. now you gotta learn the gears and the clutch. once you learn one. you can drive any and I mean any ( expect the litre-class vehicles which will be obviously tough.
The secrer here is the clutch. everyone on earth will have the minor problem of finding the sweet spot of the clutch, and each and every vehicle whether a car or a bike or even a truck will have different sweet spots of the clutches. but one you master the art, you can drive them all. R15 is not difficult at at all. the gears are quite smooth so you only need a little and I mean the slightest of the toe strikes is enough.. throttle is a bit hard but easy.
