Being able to do something is easy, but to do it well, whenever it is called upon, consistently and effectively requires drill work. Drilling a technique is the only way it's ever to become an effective technique. If someone says, "I learned how to punch and I'm ready to get in the ring," they're lying. You have to use drills while working the pads, hitting the bag, or with another person. Only then will you have a chance of executing the technique in the ring.