Navigating from scene to scene

Right now I am making my game demo. In the game demo, you have to navigate from scene to scene by buttons. It is harder than you think to make buttons. You have to make the button, convert it to a symble, get codes, and get them all in order correctly. It is not hard untill you mess up. Once you mess up one time, you have to start all over on ur game demo. It get very frustrating when you get the worng sode or put the wrong button in the wrong place. But once in the over and all the scenes move correctly, it is worth all the frustrations.