There's more to trimming trees than simply sawing away.
Proper trimming requires both hard work and some careful thought.
Trimming an also protect both the health of a tree and the plants around it. If you'd like more information, consider contacting a local arborist or tree worker. This is the home page of the International Society of Arboriculture. It includes Tree Care Consumer Information and a Certified Arborist List , which you can search to locate a certified arborist who works in your area. This is the trade-association for companies that care for trees.