It goes something like this, you had some great calls / trades that you didn’t take and then another similar trade comes along and you trade it and it’s the one out of ten that results in a loss, then your confidence takes a huge hit and you get ‘gun shy’ on the next good trade, don’t take it, and it turns out to be a winner. You should filter your trades, but don’t over-filter them; don’t convince yourself that there’s never a trade worth trading. If you find yourself struggling to pull the trigger, decrease your lot size so that at least you’re in these positions and feeling the influence of real money on the line, so this will prevent you from hating yourself in hindsight if you call the trade but don’t trade it.