Home improvement stores sell garage doors that you may be able to install yourself, but don’t fall into the trap of thinking that a garage door replacement is a DIY job. Replacing a garage door can be dangerous, because the springs and wires in garage door hardware are under a lot of tension, and they can cause serious injury if not handled properly. The door itself is also heavy and unwieldy, and you could easily hurt yourself trying to maneuver it. Even if you don’t hurt yourself, installing your own garage door can easily take you nine hours or longer, unless you have experience with the task and the right help.