Quote from JimmyJam:
He's telling you that to be a profitable trader, you must first focus on and manage your losses.
Every profitable trader learns to manage their losses first, and then they can develop a method (plenty on this website for free) of placing winning trades.
With an account the size of $40,000, if you limited your loss to $800 per trade, that would be 2% of your total capital base.
You are asking the wrong question.
The correct question for any trade you place is:
How much can you lose?