Mental toughness means being realistic, unemotional, rational and focusing your attention on what matters. It’s also important to be able to relax because it’s extremely difficult to be successful in a state of tension and fear. It may help to approach the deal as if it won’t work, then you won’t become so emotionally committed, can have some fun and still be realistic.
Something to remember. No one can make you feel negative, angry or inferior without your permission.