Do pressure points work?

Do pressure points work (Dim Yuet) The trouble is with many higher skills like dim yuet requires hours of training and dedication, to know where points are is easy, the art of training is much harder, there are few people today who can really use this. This may be a way of saying that it don’t work because when,  some raged pshyco is going to tear your head off, will you have the skill to hit a point. Actually when a person is raged the blood is hot and pressure point works best at that time. The problem is to have the skill to hit and the correct angle and timing. And when you think about how much training must go into that type of skill, its not surprising that people cant believe they work due to the fact they can only spend 2 or 3 hours or more a week in normal class let alone training in this elite art. First you have to spend many years training in gung lik drills, not just forms. But gung lik training. In the older days you study one point a month and learn to attack its source. so they do work but finding a person who can do is rare