One of the really helpful things I did after being lucky to get off my own casino rides without getting hurt was to read Alexander Elder, starting off with 'Trading for a living'. You can infact download all of his books from rapid$hare for free.
One of the things he keeps repeating: if trading evokes gambling-like instincts from you, keep away!!
Another gem: realization of you and only you are responsible for the positions that you take and the reason behind them. So, read another gem of his: 'Entry and Exits' where he illustrates many successful traeders' experiences.
