Experiencing the failure of a technique is just as important as experiencing success of the technique. When failure is experienced, take the time to explore contingency options.
In the dojo, people often unintentionally manufacture success by creating optimal conditions for a technique- certain distancing, against a certain attack in a certain way, or unconscious complicity on the attacker’s part. Be aware of this tendency. Sometimes this is necessary in the initial stages of teaching or learning new techniques. Be up front about this fact with students and with yourself. Know when to take the “training wheels” off.