Consistent And Discipline

In order to realize the full potential of your trading systems it is critical that you take every trading entry, adjust every stop, and close out every trade as and when your system says you should do. This takes extreme confidence in your trading systems, good robust reliable technology, and the mental discipline to stick to your trading plan whatever happens.
An underlying assumption about being consistent and disciplined is that you have a pre-defined plan for every situation you may face in your trading, so that you know how you are defining what being consistent is. Your plan needs to include at least the following items:

All your trading rules for entering, adding to, and exiting positions
What you will do if your trading computer, internet connection, broker, power, telephone
etc. fails
What you will do if you are unable to trade
What you will do if you lose X% of your account
What you will do if all the markets are closed and you cant exit your positions

Unless you write the answers down to all these issues, you cannot be consistent and disciplined in your approach to trading and if you lose money you will not know whether it is because you didnt follow your plan, because your plan is incomplete, because your systems do not work, or simply because you are going through a losing period.

Psychological

The goal of any trader is to turn profits on a regular basis, yet so few people ever really make consistent money as traders. What accounts for the small percentage of traders who are consistently successful is psychological—the consistent winners think differently from everyone else.

The defining characteristic that separates the consistent winners from everyone else is this: The winners have attained a mind-set—aunique set of attitudes—that allows them to remain disciplined, focused,and, above all, confident in spite of the adverse conditions.

Those traders who have confidence in their own trades, who trust themselves to do what needs to be done without hesitation, are the ones who become successful.They
no longer fear the erratic behavior of the market. They learn to focus on the information that helps them spot opportunities to make a profit, rather than focusing on the information that reinforces their fears.

You don't need to know what's going to happen next to make money; anything can happen, and every moment is unique, meaning every edge and outcome is truly a unique experience.

The trader that it's his attitude and "state of mind" that determine his results.

The Psychology of Investing

Investors need to pay a great deal of attention to what influences their behavior. Three tendencies are particularly relevant for investor: consistency and commitment, social validation, and scarcity.
Psychologist discovered that after bettors at a racetrack put down their money, they are more confident in the prospects of their horses winning than immediately before they placed their bets. After making a decision, we feel both internal and external pressure to remain consistent to that view, even if subsequent evidence questions the validity of the initial decision.
So an investor who has taken a position in a particular stock, recommended it publicly, or encouraged colleagues to participate, we feel the need to stick with the call. Related to this tendency is the confirmation trap: post decision openness to confirming data coupled with disavowal of denial of dis confirming data.One useful technique to mitigate consistency is to think about the world in ranges of values with associated probabilities instead of a series of single points. Acknowledging multiple scenarios provides psychological shelter to change views when appropriate.
There is a large body of work about the role of social validation in investing. Investing is an inherently social activity, and investors periodically act in concert. Awareness of breakdowns in the diversity of opinion and respect for extreme valuations can help offset the deleterious impact of social validation.
Finally, scarcity has an important role in investing (and certainly plays a large role in the minds of corporate executives). Investors in particular seek informational scarcity. The challenge is to distinguish between what is truly scarce information and what is not. One means to do this is to reverse engineer market expectations- in other words, figure out what the market already thinks.