Go with big equipment early and often.
Get somebody to run the equipment unless you know what you are doing. I own a large backhoe and I still am better off having someone else run it.
Unless you want to be grubbing for years, get a dozer to come in and do the work. Have him push the debris into burn piles if you are allowed to burn. If not, push them off to an area out of the way and make a backstop for your shooting range.