For safety reasons, leaning trees are best removed by a professional, as they may often tear away from the hinge, causing you to lose control over where the tree falls. If you choose to cut down a tree leaning slightly, avoid cutting off root protrusions before you start. Make your hinge a little longer than usual by cutting it deeper (up to 30% of the diameter) and applying a wedge into the felling cut on the side the tree is leaning. Stand away from the direction the tree leans while making your felling cut.

The best time to cut down a tree is during its dormant season, typically in winter or early spring, after all the leaves have fallen. Removing a tree during this period is advantageous for several reasons. Frozen ground helps secure the tree stump, protects the surrounding landscape from damage, and reduces the risk of the tree falling in an unintended direction. With the leaves gone, there is less risk of the tree's foliage getting tangled with other trees. Additionally, since this is often a slower season for tree services, you may be able to hire a professional at a lower rate. This dormant period is also the best time for tree trimming.

If you’re taking down a tree that you don’t suspect is affected by disease or pests and it’s nowhere near your home or other structures, then calling in a tree company should work fine. However, anything more involved means an arborist is a better option. These pros have years of experience with tree removal and can safely take down trees located next to structures, and they have the tools, sanitization equipment, and experience to remove sick or dying trees without infecting nearby trees. 

Pruning is an effective way to prevent a diseased branch from infecting the rest of the tree. If the infection isn’t caught early enough and the pathogen has spread to the trunk or the majority of the branches though, it is too late to prune off the affected areas and you’ll likely need to remove the tree.