Did you mean to have good psychology in trading? To have it , i think we not need to do meditation. We should be keep learn and learn to more to understanding price action and to know all risk of trading, and we should be minimize the risk by make risk management . I dont see any relation between trading and meditation.
Honestly, having a good psychology when it comes to trading is not even something anyone can do if the mentality they bring into trading at first is not right. No matter how you want to meditate, if you approach trading as gambling, you have no strategy, you have no knowledge, you have no confidence since you have no skills at all, there is no amount of meditation that will actually make you successful at trading.
As far as I am concerned, the best way to trade is to build confidence in yourself, and the best way to build confidence, is to make sure that you have learned enough and you have been able to back test your strategy to see you are good to go. Meditation will not get all of that done for you the last time I checked.