If you choose to perform fixes on your own Daelim S One then it is always recommended to have access to a Workshop Manual to use as a reference if you want to know techniques to take off a specific part such as the Gearbox and install it again adequately.
Daelim S One Workshop Manuals will give unique diagnostic facts for your car so if something is faulty it will help you discover what the issue is and the way to repair it. After that you can analyse if this can be achieved by yourself or if the job is simply too big you can actually book your S One into a suitable mechanic.
Daelim S One manual