Work out your BMR and how many calories you burn each day (online calculators will do this for you) The theory is if you eat 500cals less than you burn each day you'll lose 1lb a week, but because you have that bit more to lose, I'm assuming you'll be able to eat 1000cals less a day without going under your BMR (and risking health problems) so you should be able to lose 2lbs a week no problem. It'll probably be quicker the first few weeks as your body will be in a sort of shock that you've stopped feeding it as much.
Other tips- eat off a smaller plate (I use my toddlers!)
Use a food-log to see exactly WHAT you're eating (I use food focus too as its free, and you can see the fat/carb/protein content in what you're eating)
Drink lots of water- if you think you feel hungry- drink a glass of water & wait 10mins- if you're still hungry eat a small snack
Try and eat regularly- start with breakfast, snack, lunch, snack, dinner (evening snack if you like) so that you don't end up starving and binge on cr*p
Eat as fresh as possible (no processed foods/ready meals)- this will involve a bit of time & planning but it'll be worth it?
And finally- take one day at a time! If you end up splurging one day, don't just give up? Remember that 'skinny' people occasionally eat loads and they don't suddenly blow up, so one or two incidents won't make a difference if you start afresh the next day?
Good luck?