There is always risk or luck can help but luck is not eternal
It is more about risk in Trading and not luck. When you are trading, there is a lot of ways on how you are going to trade, depends on what will suit you, there is this thing called day trading, margin trading, and so many more, of course there are also many approach or strategies that you could apply to avoid too much losses, because you can't trade without any losses at all, luck is just for gambling because it is all just random algorithm which you can't predict that is why you would experience much more losses in gambling than in Trading.
Trading is an easy job where you could minimize your loss to the point where you will think that you are not losing profits at all if you are going to spend the right amount of time, efforts, and hard works to learn every edge of Trading.
For completing the full trading course each trader needs to stare charts for five years, no joke. This number is estimated by the different groups of professional traders who have more than 10 years of financial market trading experience. After having an inside feeling about the price patterns which repeats itself periodically, the additional tools like indicators, oscillators, fractals on the charts become useless for the pro trader.
The luck factor can not be denied in the markets for the short term trading but it loses its meaning after making several trades which weakens the role of luck. The long term thinkers always ignore the luck, they have sufficient appliances for reaching their goals without external factors with minimizing the risk for maximizing the profit.