Trimming trees can be dangerous work. If trimming involves working on large trees the knowledge and use of specialized equipment is very important, not only for the safety of the person(s) pruning the tree but also for the surrounding property where the tree stands; homes, businesses, automobiles, on lookers and passers by can be put at serious and unnecessary risks’. Other considerations need to be taken as well when working on trees that are next-to or near-by electrical power lines or have electrical lines running through their branches.A professional arborist can provide the services of a trained crew, all the required safety equipment, liability insurance and of course the knowledge and experience that can only come with the job.