SOF selection is an equalizer. It's an egalitarian machine designed to reveal what's inside each candidate when suffering. It's in this suffering that your character - the raw material that determines whether you have the potential to become an effective special operator, is revealed. The suffering is the point. 

It doesn’t matter how good you are. You can't out-exercise the machine. You must know and expect that you will, at some point, hit rock bottom. You must train for this and plan to move forward through that moment. The skills you have at that moment will be those you practiced in the years leading up to it. 

Don’t be so arrogant to think that you can prepare well enough to avoid this reckoning, or it will catch you unprepared and you will become another statistic.