If you choose to accomplish maintenance on your own Kawasaki ZX 6R then it is usually a good plan to have a Workshop Manual to use as personal reference in the event that you want to know the best ways to remove a particular component for example, the Wheel Bearing and fit it again in the correct way.
Kawasaki ZX 6R Workshop Manuals provide you with specific diagnostic details on your car so if something is broken it helps you identify what the situation is and how you can correct it. Then you are able to assess if this can be achieved by yourself or if the job is simply too big you can still book your ZX 6R in with a suitable friendly mechanic.
Kawasaki ZX 6R manual