Another vote here for myfitnesspal. I lost 4 stone by myself while still cooking for the family (which was always the problem - no time to start cooking fancy menus for myself and 'normal' food for them - I started from the premise that we all basically needed to be eating the same, just different amounts!). So I found loads of lower calorie main meals which I religiously stuck to for me with regard to amounts of carbs (weighed everything!) but others could have bigger helpings if they wanted/needed for their needs. I was also really strict about no take-aways for the first 6 months, but now we might have one every 6 weeks or so - there's no need to be completely deprived of treats, just to be more careful where and how you include them.
Just over 2 years on from when I started, I'm still at my 67kg goal weight (which is fine for my 5'9" height) and I know that partly what's helping me maintain that is because mfp has become a regular part of my day. It really helps to keep track every day to keep bad habits at bay, and to stop complacency getting the better of me.
Add in some exercise you can manage/enjoy to help get it all going in that way too, and you can do it. It won't be fast, it won't be a quick fix. (They really don't exist without artificially aids like surgery or very low cal diets.) But you can do it. As someone else said, split up your goals into smaller ones - lose a stone first, then reassess everything on mfp and start on the next stone. Just keep thinking that this is your new way of life. You don't have to 'deprive' yourself, but you do need to take a long, hard look at how much your body really needs, rather than the habits you've fallen into have fooled you into thinking it does!
Good luck!