If you want to execute adjustments on your Honda Rune then it is always recommended to have access to a Workshop Manual to use as reference should you want to know proven methods to take off a certain component for example Gearbox and fit it again accordingly.
Honda Rune Workshop Manuals will give you special diagnostic details for the car therefore if something is wrong it helps you discover what the problem is and some ways to correct it. Then you are able to decide if this can be done by yourself or if the job is just too big you could make a reservation for your Rune in with a local garage.
Honda Rune manual