Hi there. I have a couple of suggestions for you.
The first thing I"m going to say (and you may not like to hear this, but I'll put it right out there): I think your goals are unrealistic. I'm not saying that to be blunt or rude, but because of this: when people set unrealistic goals and can't keep them, they feel like they've failed and they give up. One of the BEST things I ever did was set REALISTIC goals. Accomplishing something makes you want to continue - so set goals you can accomplish.
10kg before Christmas is 22 lbs in 8 weeks. I don't know how much you weigh now and that can make a difference, but it's highly unlikely under normal circumstances that someone could achieve that. Under holiday circumstances, with the type of foods that are going to be available over the next 2 months, and the parties, and everything else ... it seems like a recipe for failure.
2 hours a day of exercise is not only excessive and something you can't keep up- it's totally unnecessary. It almost sounds like you're trying to punish yourself into losing weight. If you don't normally exercise, then there is no way you'll be able to complete 2 hours a day every single day. After the first few days you'll be sore and tired and may even be in pain from using muscles that you've not used before - and you'll HAVE to take a day off. If you don't take a day off, you'll risk injury or damage to your body, or your body will quite simply quit and you'll get ill.
A much healthier option is this:
Find out how many calories you need to eat to be healthy and still lose weight. For most people, that's going to be about 10-11 calories per pound of body weight. For example, I weigh 170 and so I eat around 1700 calories per day.
Register for a free account at fitday.com or thedailyplate.com and start logging your food. You'll see how many calories you're getting and where your nutrients fall. You want to make sure that the calories you eat are healthy calories - lean proteins, complex grains, and healthy fats - and not junk.
Try making slow substitutions in foods to help get you on the way. Instead of sweets, eat a piece of fruit. Instead of chips, crunch on veggies. I know it's not the same, but it's a start.
Try to have a bit of protein and either veg or fruit every time you eat. Then fill in around that with other things.
Get a little bit of exercise every day - weight training and strength training is very effective for weight loss and there are lots of good threads on the board about them (look for posts by Steve). But make a plan to exercise a minimum of 3x per week for between 30 mins to an hour. If you can get in more than that, great! But set 3x as your Must-Do-It goal. Make sure that you get your heart rate up there and that you're breathing hard and sweating by the end of it. For some people that means really busting it out, and for some people that means a fast walk. But the more you do it, the better you'll be able to do it.
If you set reasonable goals and be consistent with them, you'll be able to lose a nice amount of weight by Christmas.
