Everyone is under pressure. In a survival situation your under even more pressure.

Just about everyone has experienced a situation where you choked. You know what your doing. You have experience. Normally you can do the job easily. But this time you choke. You can't do anything right. Your all thumbs and it is all down hill from there. Everyone has been there.

Choking in a survival situation can make you useless.

Why is it that sometimes you choke and sometimes you don't? How can an otherwise easy task become seemingly impossible? What can you do to avoid choking under pressure, or at least lower the odds?

http://scienceblogs.com/cortex/2008/03/how_to_think_under_pressure.php

To survive you must act. To act well you must use your brain. How you drive your brain is at least as important as how you drive your gear.