I have day and swing traded for 6 years and work for arguably the top Direct Access firm for the last 2 years. I have seen the best and worst traders, one day gains/losses that you can't even fathom and what characteristics and traits every one our profitable clients have maintained and follow. Number 1: Discipline. There is no emotion involved when an entry and exit point is established. You should have 3 reasons why you open and close a position. Number 2: In regards to DayTraders (DT) ACCEPT bad calls. No one is perfect and you WILL be wrong at times. Don't average up/down or talk yourself into turning your daytrade into an overnight ect; Number 3: Swing traders MUST have the staying power to weather a bad call. Market Makers (MM) thrive on traders who are over leveraged thinking they bought at the bottom or shorted at the top. MM's have an advantage: they see all the stop orders on they're books and WILL scare you into closing your position. If you like a stock and have your 3 reasons why, don't let them Whipsaw you. That's staying power. I have many more suggestions but I'm new on this board and not sure how heavily read this thread is so if anyone has any questions I have more info and answers than you probably want to know.
