My confidence is usually pretty high by September.....what I am confident of right now is that I do not see an intense, or even moderate ENSO event next season....just a matter of which side of neutral it will lay. The Pacific has been my strength with respect to seasonal forecasting....its the Atlantic and polar domain that I have really struggled with.
I have nailed (verification is defined as within .3 either direction) my ENSO forecasts 7/8 seasons.....however, you would have been better served assuming the opposite of whatever I forecast with respect to the NAO, as I am 0/6.