Most people attempt to learn an instrument at some point in their life. For a large amount of people it may happen in elementary school as they become a part of the school band or orchestra, or it may be in high school when they realize they want to start a rock group. Whatever the case, a substantial number of these attempts will either fail immediately or run out of steam eventually, and the subject of how to practice musical instruments may have something to do with this.
It all comes down to enjoying practicing. If you do not enjoy practicing you will not be motivated to do it. This motivation comes from being able to make the music that you enjoy. If you have a goal of what type of music you want to be able to make, what you want to do with your instrument in other words, then it will be much easier to see the correct practice path.
One of the best ways to ensure motivation and enjoyment of practice is to make noticeable improvements in your playing. When you can observe yourself getting better over time and getting closer to your goals, it will go a long way towards motivating you to keep practicing. This can be done by ensuring that you have a good private teacher, and if not, by using the vast amounts of information that can be found on the internet, including articles on guitar playing or whatever your instrument is.
Besides showing improvement, another aspect of enjoying playing and practicing your instrument is to employ creative practice routines. This means that instead of running through endless scales and relying on rote memorization, try to make your practice musically creative and engaging. One example of this would be to improvise with a new scale you have learned instead of playing through it up and down. Find a song to play it over and practice actually applying it musically.
Not only will this idea be more enjoyable because you will be creating music, but it will help you develop additional skills of melodic intuition and instrumental familiarity that you do not get when just repeating exercises. Look for other ways to do this sort of thing to keep your practicing fresh.
Finally, another important factor to having enjoyable practice is to have a nice instrument that works well and is a joy to play. Many people start out with cheap models of their instruments to learn on, but if you are serious about learning an instrument, you need one that doesn't fight against you and produces a tone that is pleasing to hear.
You can find instruments that are not too expensive that will allow you to enjoy playing, so take the time to do so. Read guitar reviews online if you are looking for a guitar and get advice from other violin players if you are interested in violin.
You should decide if you are serious about playing an instrument before you try to start, and if you are, you should approach it with full effort. By having the right equipment and employing musically engaging practice methods, you should have all you need to go the distance with your instrumental education.