Fighting the Dark Side
There are many things to consider when you realize you're being seduced by the dark side. The first of these is knowing that you can only be tempted by the dark side if you allow it to tempt you. It is your own personal version of the dark side, or a dark you, that is tempting your light side. In actuality, you are tempting yourself. Self-control is the only way to stop it.
Second, you must ask yourself, "Is what I see better than what I could have on the Light Side?" The dark side likes to seduce you and make you think it will give you power, but really it is only clouding your thoughts and cannot give you everything it promises.
But if the answer to the question above is yes, then the only option is either to join the dark side or join the grey way. The grey way offers both the light and dark sides to a Jedi, and if you cannot live without the dark side but still wish to remain with the light as well, then it is the only way.
Yoda said that once you start down the dark path, it will dominate your destiny forever. This is incorrect. Anyone can be turned from the dark side.