Unless you are a professional tree service operator yourself, it is best to hire a professional who is experienced in the removal and trimming of large landscape trees. A qualified company will have equipment and professionals specifically trained for this type of work. They will also have a detailed contract that addresses all of the particulars involved in the Removal and Trim process. This will ensure that both you and the company are aware of any potential liabilities, and that any damages done during the process are covered.