This is the hardest thing to master I believe. The technical stuff was easy to learn compared to the mental. But it seems that I see so many traders thinking if they just learned more about the markets they will be successful.
Re reading Douglas book Trading in The zone.
Awesome. Very few traders seem to be brave enough to take on the mental side of trading, which is the make or break aspect of long-term profitability and the most difficult part of trading to master. The Douglas book "Trading In The Zone" is NOT a good book to work on your mental aspect of trading contrary to popular belief.
It's a great book and written really well, however, he does not tell you HOW to change your mental side of trading, nor does his seminar. I assure you, thinking in probabilities does NOT stop emotions from highjacking your trading plan (right brain thinking/logical thinking).
The one book that stands far above all is "Mindful Trading: Mastering Your Emotions and The Inner Game" by Rande Howell. I highly suggest getting the workbook with it. You can find both on his website ( mytraderstateofmind (.com) ).
I've read countless books and have taken countless courses. Of course the go to as you mentioned, "Trading In The Zone" which is incredibly weak on actually teaching you HOW to work with your emotions (which are actually BIOLOGICAL first, mental second), of course the Van Tharpe stuff including his recorded seminars. Trader Mind by Steve Ward; Trade Mindfully by Gary Dayton and many more which I won't list.
Be patient because it will take you some time to work through stuff. At least two months before you start to see real results in your trading, but then it snowballs and within a few months you will see a HUGE positive difference in your trading results.
I promise you if you don't work through the mental stuff you'll be like a hamster on a wheel. Doing a lot of work but going nowhere fast and seeing absolutely no longterm positive results in your trading. No matter what technique you add to your trading, because you won't be able to trade it worth a darn because your emotions will high jack your trading, time and time again.