Fear needs to be addressed as well as competence under pressure.

You do not have to endure severe combat training in order to see how you cope under duress.
It can be done safely and playfully. If this sounds improbable, look at sport.

What matters is the core requirements:

1. Keeping a cool head
   - no anger
   - no upset
   - no panic
    
2. Decisiveness
   - action
   - no dithering
   - no getting ready/anticipating
   - no worrying
    
3. Effectiveness
   - does it work?
   - are you able to follow it up?
   - can you improvise, adapt and change?

You need to know that the material works and have the confidence to use it when the situation is unpredictable and confusing.