I think it is very necessary to have a trading journal as a forex trader. As a forex trader, it is important you keep adequate record of your trading activities; this helps you to track your trading performance. When I record my trades and I suffer a loss, I don't say I am just being unlucky. No I go back to my trading journal to examine the lost trade and possibly learn what mistakes I made. When I started forex trading, I was quite impatient rushing in and out of trades, I lost a lot and when I reviewed my losses using a trading journal,I discovered that I was trading against the trend when my MACD (which is a lagging indicator) was telling me not to and I quickly corrected this, and when I review my winning trades on my trading journal, I saw patiently keeping in track with the MACD was helping me a lot.