I should probably start another thread for this point, but it's just something I've noticed here.
I lost 4 stone myself in less than a year, (4 years ago and have maintained) in fact the first 3 stone came off in 3 months and I lost the next stone very slowly.
What I found difficult to deal with was other people's reactions; telling me I'd lost too much (I hadn't, I got down to bmi of 22), that I was losing it too quickly... people were generally suspicious and not very supportive. I think people have some sort of block about weightloss and how 'easy' or fast it can be when you really, really work at it.
I lost mine through myfitnesspal to begin with, and ever since I've stuck to a smaller dinner portion/banned going for seconds, and I just allow myself one biscuit with my tea or coffee... I used to eat up to 8.
We stopped getting takeaways every weekend too, but do still get them maybe once every 3 weeks, and when we do, I have to compensate by exercising and eating less the next day.
Now that I've written that down, I can see that yes, it is 'hard' - it takes discipline and determination, and I know that if I take my eye of it for even more than a week, I'm up 5, 6, or 7 pounds. I weigh myself once a week or every second week.