With kawasaki's positive neutral finder, it should be easy.. the only thing you should be able to do from first gear at a stop is to shift into neutral. It should not allow you to shift into anything other than from first to neutral (or vice versa) when you are stopped.
If you stopped while in a gear other than first, it can be difficult to then shift down through the gears back to first or to get to neutral due to the way the motorcycle tranny is designed. In order to shift through each gear, the gear dog teeth on both transmission shafts must be aligned correctly. Normally the gears are spinning when you're moving, so that allows them connect/mesh easily. If you're stopped with the clutch in, the gears are not spinning, and if the gears did not stop at a properly aligned point, you will not be able to shift. If you let the clutch out a little bit, it starts turning the shaft so the dogs can align, at which point you're able to shift. The best 'habit' to have is to downshift to first before coming to a complete stop. You should then have no issues shifting to neutral from there.