This is a peek at the "edge" of the fill, now that the water has dried up (we haven't had any rain for two weeks, so things are getting back to "normal"). There was already a natural high spot around the largest pine tree trunk; my finish grade will match that, then slope very gently in two directions, towards the paved road straight ahead in this picture, and towards the pond to the left in this picture. The lowest spots have been filled almost 2 feet; some areas only need a few inches.
For now, I'm rough grading by eye, and leaving it a bit high. When I get enough of it close to what I want, I'll break out my surveyor's level and use it to shoot grades, installing stakes with grade marks to get what I want. The grade will be so gradual when complete (approximately 4 inches over 100', about .3%), that it has to be almost perfect or it won't work. The simple reason for the very gradual slope is that we don't have much to work with when we start out flat! My property is almost 300' wide; one side will have to be about 1 foot higher than the other, and that will have to be fairly consistent over almost 800' of length of the property.
A couple of comments; yes, I am having fun; I tend to be detail-oriented and very persistent, so the repetition is soothing. The tiny TC18 is turning out to be almost the perfect tractor for many of the areas; the small size and 4' bucket fit perfectly in amongst the trees so they don't have to be removed to fill. I'm aware that filling so much around the trees could kill the trees; they're mostly young and healthy, and I'm hoping for the best. It seemed like a good idea to take a risk of hurting them and having at least some survive rather than knocking them all down, first. I'm NOT filling around the old growth oaks; they have a natural hummock built up around them.