Also, have you read "The Eye of the Needle" by Ken Follet? That guy should be your role model.

Because you are correct. It's all about your mindset and practicing so that it becomes reflexive. So that you don't make simple errors and screw up under pressure.

You have to be able to smile and talk your way through a checkpoint. While you have a bomb in the box labeled "Urgent Medical Supplies, Human Blood" under the ice and bags of animal blood.

It takes practice and aptitude.