If you choose to execute adjustments on your Dafier DFE 100 then it will always be a good plan to have a Workshop Manual to use as personal reference just in case you want to know how you can strip off a certain component for example Drive Shaft and install it again effectively.
Dafier DFE 100 Workshop Manuals can offer you precise diagnostic info for your car so if something is not working it can help you discover what the issue is and how to resolve it. After that you can decide if this can be achieved on your own or if ever the job is just too big you could book your DFE 100 into a decent garage.
Dafier DFE 100 manual