Currently I have lost 2 stone in about 3 months. I thought I ate pretty well until I started looking at the calorie content in things,and realised how much I ate just for the sake of eating. So my advice is to watch what you eat and make sure that you really are hungry before you start snacking! Also if you do need to snack, make sure it isn't crisps or choccy, I now have grapes or celery, or Space Raiders as a special treat (68 cals per bag!!)
Also, once you start eating differently you will notice a change in other things too. My fitness has improved (obviously) and, maybe not important to you, but my hair and nails have grown stronger and better!
I can't exercise a lot as I have back problems but I try and walk as often as I can, even if it is just round the local field. I can even jog to the post box and back now, a few months ago I was out of breath walking up a hill!
Some more advice is to vary your diet, otherwise you will just get bored and go back into your old ways. And don't deny yourself everything. I used to get in a tearful mess in the early days cos I really *needed* pizza, so if I start craving somethig, I will have it, but then maybe go for a walk or eat less the next day.
So yeah, thats how I got from being a 13.5st heifer to an 11.5st fat bird, and still losing weight to become pretty
