How can I properly trim a mature avocado tree?

To properly trim a mature avocado tree, start by removing dead or damaged branches. Then, prune back any branches that are crossing or rubbing against each other. Avoid cutting off more than one-third of the tree's canopy at a time to prevent stress. Use sharp, clean tools and make cuts at a 45-degree angle just above a bud or branch junction. Regularly prune to maintain the tree's shape and promote healthy growth.