I been doing this a long ass time. When I buy the pack of chic it tells us what the weight is. So, I just eye ball approx. I dont see the need to lay a raw breast on a scale to make sure it is 6 or 8 oz. I think ball park is ok. Because you are eating protein day after day after day. You will have a higher day and lower day here and there. IMO it all balances out. Yet, I measure my oats and grains. Never worried about fats ever. Then I just go week to week and see how I am progressing in my weight loss goals. If I'm stuck at a weight I add some cardio. When I reach that weekly goal. I let myself level off.
I just try to reach my goal weight and look by 4 weeks out. From there it is time to really get that peeled look. Then I get real tuned into the final 30 days.
best of luck,
KD