I have great success with calorie counting, but I didn't do any low-carb plan first; not sure if my advice will be totally helpful, but I'll try.
I think making the switch is as easy as getting used to weighing/measuring your portions. Calorie counting allows you anything you want--as long as your portions are reasonable. It's easy to mistake "big" for "reasonable," at least it is for me, so I weigh out my food on a kitchen scale. Using measuring cups and spoons also works, although you have to remember that heaping cups are not allowed.
I don't think that most low-carb plans involve much counting, so that's an aspect that might be a little new. You probably won't need to change a thing about how you treat vegetables, though, and you'll be pleasantly surprised at the fruit options you have. There are a lot of higher-carb fruits that are stilll plenty low in calories, so you can indulge pretty freely in them.
One thing that has helped me a lot is that I only enjoy the really calorie-dense stuff that I could eat by the pound in small doses--I don't even bring a big package of them into my house. For example, if I'm fiending for some chocolate, I walk to the store, buy a
single small candy bar (no king sizing), and enjoy it. Once it's gone, there are no more within easy reach, so I'm not tempted to go overboard.
Some people can do those 100-calorie snack pack boxes. I cheerfully admit that I am not one of those people.
If I had those in the house, I would eat an extra 800 calories that day, 100 calories at a time. Instead, I get low-calorie treats that fulfill the same desires for crunchy/salty/sweet/whatever and work those into my 1500-calorie-a-day plan. For sweets, I eat fruit or occasionally Skinny Cow frozen treats. For salty crunchies, I eat fresh vegetables with hummus or (rarely) Popchips.
Hope that's some help.