You will eventually get to the point that you will be able to drive up to a yard, and know what you need out of it just by looking. No measuring, etc.
Just for some advice so you don't have to figure out on your own..... Whatever you are figuring on paying your employees, add 50%, give or take a little. That will be your actual cost in employing them. IE If you are paying Jane Doe $10.00/hour, it is actually going to cost you around $15.00/ hour once you figure in the employer portion of your payroll taxes, workers comp, unemployment insurance, and the bookkeeping time associated with these.