Beginners luck is real but I think it can only be possible when the beginner have little experience in the system by having a little bit knowledge of what to do at the right time and when trade is favourable. However, bignner luck may also be dangerous sometime to the begineer because it can give the begineer overconfidence which may result to losing all he has gained including his capital.
If a beginner, after he gets a profit thanks to luck, continues to trade, sooner or later he will lose not only the profit he received, but also the money that he originally had. Therefore, you should not rely solely on luck, it is necessary for a beginner to gain knowledge so that his trade becomes profitable.