I don’t know your situation that well, but I wouldn’t have a dozer to remove trees! There are a lot better and cheaper options. Are there any goat farmers in your area? Goats do a great job of destroying brush and young trees. With temporary fencing you and the goat owner can determine and vary boundaries. What type of large trees do you have? Is there any thing that you can harvest from them? Fruit, nuts, sap, lumber or shade have their value. This is just the tip of the iceberg. You might be surprised that you can have great returns with low inputs. But it’s your dream do what you see fit. Good luck