Gilligan said:
How do you develop ice in your veins?
When trades become impersonal. I think it just takes time.
Next...position sizing for me anyway. Whenever I used to be too heavy or fat in a trade I used to see anxiousness during the trade. Now I am kind of just meh towards it. I don't enter trades unless I have confidence I can make money to begin with. If it turns against me big deal. Next trade.
Knowing the posture of something being still in good shape or at risk of losing the trend (opportunity) makes a huge difference as well.
Wealth gained hastily will dwindle. but whoever gathers little by little will increase it.
Proverbs 13:11