A very common mistake that many beginner musicians make is playing with tension. Sitting in a relaxed manner and relieving all muscle tension in your hands, head, arms, chest, legs, back, and wrists is vital. Bad posture habits can also cause tension, which makes it more difficult to actually play and may potentially cause an injury later on. Learning good habits will enable you to be less tense mentally, which will result in faster music learning, better sound, and more easily attained technical ability.
Another mistake many beginners make is not practicing often enough. Many musicians, when learning their first pieces, do not establish good practice habits. If you find yourself making many mistakes during the early stages of learning a piece, you could be practicing incorrectly. Perhaps take a day or two off a week; not in succession, but when you practice, you are programming your brain with short-term information. If you take too much time off you could lose a good deal of that information. Also, if you take lessons with an instructor, try to have lessons every week instead of biweekly. It will encourage you to make faster progress. Also, make sure you employ other important practice techniques, like practicing hands or voices separately, listening to a recording of yourself playing, or trying several tempos to find the best one for practice and performance.
You also should not limit yourself to one style of music. If you want to be a musician, you will definitely not want to set up barriers for yourself by only learning one style. You might prefer metal, but you will learn a bunch of useful concepts from classical and jazz to apply to metal. Some styles make some musical concepts easier to grasp than others. A big part of understanding music comes from studying its origins. A lot of students get caught up in what is happening now and that’s all they want to look at. What’s happening now is a result of what happened before. Analyzing what was done before can lead you to deeper insights about current trends. If you don’t like music’s current state, you might go back in history and build a new direction off of a previous time in music’s history.
Many of the beginning mistakes can be reduced to impatience. There is a lot to learn and it doesn’t always happen quickly. You my even discover it’s never-ending. Its important to remember there’s no blueprint for learning. You don’t have to meet certain goals by a certain time. Just keep at it and it will come.
Some final advice, also important: Seek beauty, not perfection. When you make beautiful music, perfection finds its ways in. Its much better to take it back a notch, think about and examine the music closely, take a break, spend time with the music away from the instrument, and of course practice things slowly. Then learning to play will be enjoyable
Something incredibly important is to enjoy every moment of your musical development. You will always feel like you can play better and that there’s so much to learn, which is true and you should continue to strive to do that!!