If you have trees, you probably need to get the pruned from time to time, so dead branches don’t come off in the wind, or if they are approaching buildings and could cause damage. Sometimes, branches need to be removed because of disease or damage. With the taller trees, the tops might be crowding out the newer growth below, or the tree is just getting too tall. You might need pruning for shaping and designing the look of the tree.
Do it yourself, or hire a professional is often a consideration, and the number 1 rule is to be safe. Climbing trees with equipment can be very dangerous, and you want to have a professional with the right safty guards, and training to go up there for you. A professional is properly insured, and skilled to get the job done right, and make sure no other property around the tree is comprised in the process.