Here is an update of the fence project. I hired a local landscaper guy to dig all my holes for posts. He charged $5 dollars a hole. Great deal!
Each hole was about 12 inches in diameter and 2.5 feet deep. This way I could add dirt to the hole to adjust height instead of trying to dig dirt out. Much easier this way.
I used string as a guide to help me make a straight line. I used a string on top for post height and one on the bottom side for the straight line. worked pretty well. I kept all post approximately half inch to an inch from the string.
Setting the post in a straight line. Look how perfect this is. I used 2x4's to keep the post perfectly level while the concrete cures. Each hole took about 2, 80 pound bags of concrete.