paint scoop size

I have started learning to have better control over color mixing, and this is small part of my effort to apply Munsell's color theories. During this i will have to be able to measure the amount of paint that is going in to mix, and do this I do not have a measuring cup, instead I have to somehow use the pallette knife, and when ever I scoop up the paint, I have to memorize scoop size and count how many scoops. This is very crucial for mixing and somehow I never did this in past. I do not know why Art schools do not address these issues forget about letting the student practise. I am realizing that this is very crucial.