Keep in mind, as your trading day progresses, what money you have made or lost. It is much like knowing the score of a basketball game when you are the coach. Day-trading is a job, and your paycheck is determined by your ability. You only can maximize your ability if you have all the information you need to make trading decisions. If your phone, quote machine or any other mechanical function of your daily routine is out of whack, stop trading.
Frustration is the best friend of a losing day.
The more frustrated you are, the less efficient your trading decisions will be, lowering the probability of a winning day. Have complete faith in your indicators. This is a must for success. Many times your indicators give a buy or a sell signal, and you don't follow it because you just don't have the confidence the signal is right this time. Not taking a trade that is set up using indicators you have developed is calling yourself a liar.