This is part of the spreadsheet I keep. I didn't start until after I had lost the first 4kg (which was probably mostly water anyway).
I hit it pretty hard early on. I lost over 8kg in August alone !! I have backed it off a bit now and am aiming for 4-5 kg a month. Which I think is very achievable.
Tried to upload a picture, but it wants ot crop the pic smaller than what I want ?? Anyway, you get the idea.