My tricks and general things I do and will carry on doing.
Hot water and lemon, in a decent plastic bottle, once it is empty I fill it up and have another I am for 3-4 liters a day
Cut down on caffeine - one coffee in the AM two cups of tea in the evening and that is it! everything else is herbal
Try to be active every day even if it is just vigorous cleaning, or my fave saturday morning exercise
IYKWIM
Keep trying on old things from your wardrobe if the scales are sticky
Skip brekkie, small high fat and protein lunch good sized dinner
ALL the green veg in the world
Weighing every day - keeps me in the zone
One treat a day aloud at the weekend eg. =1 glass of wine, 1 small portion of chips with dinner, one small choccy bar.
No more than one massive blow out a month, I am not a saint, and sometimes I need to eat a whole pizza washed down with a bottle of prosecco.
Small goals, 5-7lbs at a time, not letting myself go back once I have passed a marker.
Low calorie/carb snacks that I can eat if I really need the urge to snack - celery, babybel (just one though!), gherkins, peanuts (25g), pepper sticks, cucumber, boiled egg etc.
Close the kitchen after dinner - if I can't get to food I can't eat it!
Take packed lunch to work and leave purse at home so I can't buy any extra.
Make plans with people you haven't seen in ages so they go WOW! 
Measurements and before and after photos to keep motivated!
Long list! But it works for me!