The answer to 'DIY tree trimming' is that it can be done safely with the right tools and precautions, but for larger or more complex tree work, it's best to hire a professional arborist. DIY tree trimming is a great way to maintain the health and appearance of your trees, but it's important to follow proper safety protocols and know your limits.
Start by inspecting the tree and identifying any dead, damaged, or overgrown branches that need to be trimmed. Use sharp, clean pruning shears or a pruning saw to make clean cuts, and be sure to disinfect your tools before and after use to prevent the spread of disease. Avoid cutting more than 25% of the tree's foliage at once, and always make cuts just outside the branch collar (the swollen area where the branch meets the trunk). Dispose of the trimmings properly and clean up the work area when you're done.