Well done tarme! That's a brilliant loss!
I've just weighed in for my first week (I started on a Wednesday), and I've lost 3kg. I'm super happy with that. Would I have liked more? Of course. But I've begun noticing things, like my jeans feeling looser and my tops looking a little baggy. I've also been to Crossfit four times during the end of the week, and we mainly did strength things, so I'm going to say that I've grown muscles (it sure feels like I've grown muscles - I'm sore!). Haha.
Yes, long term goals seem the same as yours, about 25kg by Christmas, and then I think the rest will be a lot slower to lose.
As for eating, my doctor is keeping me at about 1000 calories, and I track them on myfitnesspal and I've never gone above 1100 calories.
I cheated once on the weekend and had one of those frappe drinks that are loaded with sugar and fat. To make it up to myself I put my heart rate monitor on and stayed on the treadmill/did circuit training until I'd burnt off every one of the calories. Haha. I think I play the numbers game to give myself perspective.
Keep it up, we're doing really well
Have a good day