I agree 100%. Emotions and lack of market knowledge will kill you. When I started Investing in the 80`s I though stuff went straight up, and I hadn`t a clue about the day to day (and minute to minute) manipulations. If I bought in and saw the price sliding down, I bailed, then watch the price come back up and surpass.
To say I paid my dues was an understatement.
(You may have even made a few pennies off my butt during that time...)
Also, what will kill a trader is a lack of trading capital and more importantly, a lack of reserves. You trade on needles and pins if that $25K is all in the world you have to play with, but there`s a far different perspective afoot if you have about $500K padding under you....
Regards