Frustration is the antithesis of confidence and euphoria. It can cripple you and distract you from your sense of persistence and determination.
Unlike other teachers, I don't put a negative connotation on euphoria - as long as you don't abandon your trading rules, have at it.
You can avoid frustration in the first place by "not" having expectations of the outcomes of anything (or any trades).
This is not the same thing as Expected Value, but an emotional expectation about the result of something you're endeavoring - such as trading.
One sure-fire way to decrease frustration in your trading is to make sure that you're protective stop is not placed inside the 20-day ATR of the instrument that you're trading.
For example, say you're trading an instrument that has a 20-day ATR of 15 points. If you're long and the current market value is 535 and you've placed your stop at 530 because you have set 5 points as your max loss point, you are more than likely to get stopped given that you're stop is well within the ATR. Many times, traders with smaller accounts do just this because they don't want bigger losses. This is respectable and totally understandable.
In our coaching and teaching, we've found that traders disregard the daily vol of the instrument their trading as if it was going to change because the trader put a trade on.
We can't change the nature of things. The instrument that you're trading isn't going to change how it behaves just because you're in the trade.
In the above example, you can trade a smaller position and give your smaller position a greater latitude by placing your protective stop at 520 (535-15). You can test this strategy. You might find that you are not getting knocked out of as many such trades and, if you are trading in strong trends, take the risk home overnight and let the market forces, time, and leverage work for you.