When dealing with garage door openers installation, you first must have three T rails bolted together. An idle pulley is also required to be attached at the end of the T rail that is nearest the garage gate. Next, you need to slide the trolley and have the remaining T rail track bolted. The chains must be attached to the sprocket of the opening device so that the bracket is mounted securely. This job is a tough man’s job and if you think it is way too complicated, you better hire a professional.