What's always worried me is that if you do a lot of punching into the air and pulling your punches when you spar you learn to do that all the time. When doing uppercuts/rising punches people more often than not stop too short rather than practising following it through.
The trigger thing came from my instructor and I think works especially well for women who can't summon up the aggression in the same way men can. Another little trick is when talking to someone you feel could kick off bring your 'punching' hand up to your face, put your hand on your chin/side of the face/ stroke your nose etc anything so that you have your hand immediately there to either strike or block. It's a non-threatening movement and if they don't attack all you do is end up looking thoughtful.
The trigger thing came from my instructor and I think works especially well for women who can't summon up the aggression in the same way men can. Another little trick is when talking to someone you feel could kick off bring your 'punching' hand up to your face, put your hand on your chin/side of the face/ stroke your nose etc anything so that you have your hand immediately there to either strike or block. It's a non-threatening movement and if they don't attack all you do is end up looking thoughtful.