Have lots of calorie controlled portioned up snacks available. Snacking doesn't have to be bad, as long as you account for everything (that is, if you decide to follow a calorie counting / sw / ww type method)
I'm currently 16 stone and a short arse. I've managed to lose lots of weight using my fitness pal before - it really worked for me. I started again last Wednesday
I've started CouchTo5k too, which takes approx 30 mins 3 times a week. However, I've previously found attending a set class easier to discipline myself into going to, especially if you're going with a friend (therefore make you push each other into going even when you're knackered).
Regarding the plate piled high issue - we are very much like that. So, this week (and last time we did MFP and lost 30kg between me and DH), I've been piling half our dinner plates with a salad of baby spinach, rocket, watercress, a couple of spring onions, coriander and some garlic flakes. Properly measured out it comes to 36 cals each, and the plate is overflowing with food. Works as a psychological thing for DH. Also I've put the big plates on the top shelf in the cupboard so we can only easily access the normal dinner plates. Again, plate looks fuller = psychologically feeing less deprived.
Food wise, we eat a lot from the hairy dieter books.
Having low cal things to grab if you're feeling peckish helps - we have cathedral city 'chedds' bags, which are 67kcal, and the mini pepperamis at 40kcal, plus shitloads of bananas.
I may be just starting now, but I've been here before and succeeded in going from an 18 to a 12/14 within 4 months. This time I'm starting off at a 20, but now I'm 'in the zone' and I know the lessons I learned the last time, I'm confident I'll do it.
Good luck!