One of our course categories: "Trading Psychology and Behavorial Consequences" - (fancy term for "don't let your stupid emotions affect your trading).
1. Leave it at the door (arguments with spouse, road rage, "specialist screwed me", wife has boyfriend, etc. etc.).
2. Don't brag about profits, or cry about losses...keep an even keel...this applies to spouses as well. One of my favorite stories is about one of my best friends/trader (we'll call him "Tony"), an excellent ex floor trader, hot blooded Italian with a beautiful Hispanic wife (also "hot bloode"). Tony would call home at the end of the trading day "Hi, wow did I have a good day, I made $48,000"...and his wife would say "That's goo dear, remember to pick up diapers on the way home"....next day "Hi dear, damnit, I lost $10,000 today" wife: "oh, too bad, don't forget the milk today". LOL. Nothing phased her, and she actually kept him more grounded.
3. Don't buy any "toys" while in big positions. Just 2 days ago, one of our best traders bought a $60,000 boat while he had a couple of $million in open positions. He's down about $150,000 sine buying the boat (still up $600K for the year, but when you "try to get the money back quickly (that was spent for a "toy") it seems to always happen that you get a bad streak.
(I know were not supposed to be superstitious, but even my brother attests to this phenomenon.
4. If you have bad feeling about a trade, stomach churning, "fear"...then don't do it. Period.
(sorry to sound childish here, but....)... "You need to be "nervous enough to be focused and on the edge of your seat" "but not so nervous that you sh$% yourself".
FWIW,
Don