That bears repeating ...
"Part of what you need to learn is how to estimate carbs when you don't have exact figures to go by. It is not as hard as it sounds." Jim is right.
I use the "if its white (potatoes, bread, flour, pasta, sugar ...) its probably loaded with carbs" rule. When in doubt, cut the portion in half or just eat less. If you're still hungry, fill up on proteins, fats and vegetables.
Also, eat slower during main meals and snack in between. Nuts, cheese & veggies work for me.