Perhaps your garage door incurred damage in a storm or due to an accident. You need to fix that, so you can keep your home secure and safe. That means you need to replace the door, so you can lock everyone out completely, and keep your belongings safe. Perhaps you want to repair or replace it yourself. In that case, you need to have the proper tools, garage door, and materials such as hinges, as this video discusses.
If you do not want to have to buy or rent all the equipment to do it yourself then you need to hire a garage door installation service. Otherwise, you will need to know how to install the track, the wheels, the panels, and the hinges. You will also need a second person because installing a panel garage door requires two people. This means you need to convince your best friend or your spouse to help you install the garage door, or you can just hire someone to do it for you. This professional team will install the door for you using the proper technique and equipment.