How to lose weight?

I am 5'4 and 132 pounds. My ultimate goal weight is 120 pounds, but my goal as of now is 125 pounds. I normally snack a lot during the day (and especially after dinner). I don't want to have a specific diet and exercise plan... but if I cut snacking and just eat three reasonably-sized meals a day, do you think I will see any changes? And if so, after how long? Here's what my food consumption would look like:
-Breakfast: fruit or a 100 calorie granola bar
-Lunch: salad
-Dinner: anything my family makes (pasta, steak, pizza, etc.) but a reasonably-sized portion
I also figure skate five hours a week and do about 20 minutes of strength exercises a day (push-ups, pistol squats, pilates, etc.). I was thinking I would just try this "diet" for a month, and then continue it but in a "less strict" manner. In a month, do you think I would see changes?
How to lose weight?
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