How do you feel? Did you get enough sleep? Do you feel up to the challenge ahead? If you are not emotionally and psychologically ready to do battle in the market, take the day off—otherwise, you risk losing your shirt. This is almost guaranteed to happen if you are angry, preoccupied, or otherwise distracted from the task at hand.
Many traders have a market mantra they repeat before the day begins to get them ready. Create one that puts you in the trading zone. Additionally, your trading area should be free of distractions. Remember, this is a business and distractions can be costly.