The answer to 'how to install tree' is to carefully plan the tree's placement, dig a proper hole, plant the tree, and provide ongoing care. First, select a suitable location for the tree that considers its mature size, proximity to structures and utilities, and sunlight requirements. Dig a hole that is 2-3 times the width of the root ball and only as deep as the root ball. Place the tree in the hole, ensuring it is straight and the top of the root ball is level with the surrounding soil. Backfill the hole with the original soil, tamping it down gently to remove air pockets. Water the tree thoroughly, and apply 2-4 inches of mulch around the base, keeping it a few inches away from the trunk. Provide 1-2 inches of water per week for the first year to help the tree establish its root system.
It's important to call a professional arborist for larger trees or if you are unsure about the proper planting techniques. They can ensure the tree is planted correctly and provide ongoing maintenance recommendations to keep it healthy.