These trainers can not (with their own bodies) and half of those things that can make the gymnasts, and yet they are extremely successful in training athletes for the Olympics. It is clear that athletes rely heavily on their coaches. By now may think that my analogy of athletes and coaches is not applicable to students who are studying music and academics. Music teachers are like conventional teachers in that they convey information, knowledge of music theory, ear development, writing, improvisation, chords, scales that make up the music, etc. Part of it is true that By can find some of this information online, but can also find By there and a lot of incorrect and incomplete information! But what on the process of practice, hard work, physical techniques, finger independence, economy of motion and control voltage. All these and many other things almost impossible to study independently with Internet.
Trainer / instructor / teacher can help not only to study Bam it, but deal with it. Many self-learning players just do not know what they should learn. Many of them have clearly defined objectives and a nice, but too often players fail to understand the best ways to achieve these goals. According to Dr. Neal Barnard, who has experience with these questions. Purposeless practice can be extremely frustrating thing, it leads to that goal is unrealistic or at its achievement, it may take up to 10 times longer than they might. Good teachers can identify weaknesses that need improvement and the bad habits that need to be corrected, and many players may not fully aware of these habits or their very negative consequences that are more critical. .