Lizbud didn't really mention what kind of trees they were that is why I mentioned the oaks & other more sappy trees. Oak trees will drop off dead branches on there own but need pruning during the winter months. The leaves on the trees during the summer are food for the trees. You don't want to take their food away when they need it the most but in the winter when they are dorment you can trim them up. If you trim a maple now sap will run out & stress the tree & attract bugs, fungus, woodpeckers, etc.

Karen the trees you worked on were older trees & Lizbud's trees are just two year old babies.

Planting lawns depends on the grasses you plan to use. When the soil is warm & there are rains go for it. I have planted grass in the fall & have had real good luck because the soil is warm & we have plenty of moisture before Jack Frost & Old Man Winter are knocking at our door.