Playing the trumpet is a skill. Any skill can be taught. With the embouchure what we are doing is training the muscles. These are very fine motor skills that require a certain amount of drill/repetition so that the embouchure learns what you want it to do. The key here is to learn the proper way to learn these skills so that good playing habits develop. There are many ways to learn them wrong and develop bad playing habits. And in most cases these habits won't start to be a problem until you've been playing for quite a while. Now you have to relearn good habits in place of the bad habits. wasted time and effort. this is why it is a very good idea to get lessons from a COMPETENT teacher.