Giorginetto

My Sunroof is now not working properly . When i depress the sunroof switch it opens but not fully as before and worse of all when i close it its not secured properly and i need to vially check whyen its the right time to stop pressing the close button to ensure its closed and secured properly.

I understand its probably because these little white gears/cogs have broken . I have already ordered a set and wonder if anyon ecan give me any tips for replacing them . I read a few things on this in Grag's garage doesnt sound like a simple job at all !!!