I think you can do it if you are motivated enough.
I've lost 2 stone with another 2 stone to go - it's taken nearly a year because it's the first time I've ever done serious dieting and exercise so I've had lots of slip-ups along the way.
Now I've learnt what works for me and i'm aiming to hit my goal by the 10th of March - I want to be 9 stone 10lbs.
The only time I will break my diet between now and March is for my work Xmas party; for Xmas day and Boxing day.
I'm finding that i'm having to be almost obsessive about diet and exercise.
First allow yourself one treat food - mine is icecream which I only eat max 2 scoops of in cafes or restaurants if i'm out for a coffee. I never eat it at home.
I've had to be strict as I've got a sweet tooth so cakes, chocolates, sweets, biscuits are all just banned. Also banned are crisps, deep fried food, extra oil, extra sugar, butter / spreads, ALL cheese except Babybel Lights, full sugar sodas, fruit juices and finally alcohol.
Giving up alcohol was easy as my medication doesn't work with alcohol.
I snack on fruit and veg - I've discovered frozen fruit especially raspberries are lovely.
I eat 3 or 4 meals a day - wholemeal / wholegrain carbs, low fat protein & dairy, lots of fruit and veg.
I read food labels all the time - anything with over 3g saturated fat per 100g is out.
I try to stick to approx. 1500 cals a day maximum.
I drink lots of water, and I also drink diet sodas, and have skimmed milk in my tea & coffee.
Exercise: I try to get to the gym now 4 days a week at least. I work 2 days a week, soon to be increased by 1 day and my job is physically very hard and tiring so gym on work days isn't possible yet until I get fitter.
I do 20-30 mins weights (I use the machines) and 20 mins cardio (usually the rower).
Weights burn fat up to 24 hours after doing them.
The most motivating factor for me recently has been having my body fat and visceral fat levels measured - it's shocking because high body fat is the thing that can cause major health problems.
Positively so far even strangers are commenting on my weight loss, I've thrown out my old larger clothes, I've changed sizes in uniform, I don't sweat anywhere near as much, i'm less breathless and my knees and back are far less painful.
If I can do it so can you, you may not need to be as strict with yourself as I am because I have a sweet tooth I needed to retrain.