Weighing your food?

I don't have time to weigh all my meals. I have a basic idea on portion size and I just wing it from there.

okay so I'm about to get a scale for my food and was wondering if anyone had any tips? i know its good to log what i eat and i notice a difference in my physique when i log things down too. so correct me if im wrong but i weigh my food: after its cooked, for the gram values of both carbohydrates and protein, and to log the amounts relative to how much i need for whatever im doing )i.e. cutting, bulking, whatever). Also how would one weigh fat? does this mean the meats have to be as lean as possible?
You weigh your food BEFORE you cook it. You type in the name of the cut of meat you're using online and look up the nutritional values for it (e.g. top round, with 1/4 inch fat) and then multiply it by the weight you got. It's hard work getting started, but once you've been doing it for a while, you'll know off the top of your head that every 100g of boneless/skinless chicken breast has 27-8g protein, 2g fat etc. There are measurements for chicken with the skin, beef with different amount of fats on it, etc. So no, they don't have to be super-lean!