Replace driverside doorhandle with kessy on my Skoda superb -13, how?

I have a 2013 skoda superb that have problems with the Kessy-system, im almost 100% sure that it is the driverside doorhandle thats malfunction so i would like to change it myself cause the dealer wants almost $450 to replace it with a new one. I found a used one almost free, so i want to save some money doing it myself. But does anyone know how i remove the doorhandle? I cant find any information on how to, and with KESSY it seems quite complicated? Do i need to remove the innerpanel to disconnect the wires on the doorhandle? And how do i remove the inner plate inside the panel. If anyone have any DIY's with images or a film youtube i would be really greatful.