HOW TO HOLD THE GUITAR
You can either sit or stand while playing the guitar, and the position you choose makes virtually no difference whatsoever to your tone or technique. This really is just a matter of personal preference and it's totally up to you which you choose. You may however find it easier to sit down when you're starting off as you will find it easier to look at the frets and coordinate your fingers. Most people prefer to practice while sitting but perform publicly while standing. The one exception to the sit or stand option is the classical guitar, which you normally play in a sitting position.
To hold the guitar in a sitting position, rest the waist of the guitar on your right leg. (The waist is the indented part between the guitar’s upper and lower bouts, which are the protruding curved parts that look like shoulders and hips.) Place your feet slightly apart. Balance the guitar by lightly resting your right forearm on the bass bout. Don’t use the left hand to support the neck. You should be able to take your left hand completely off the fretboard without the guitar dipping toward the floor.
Look in the photo below as Tommy Emmanuel holds the guitar.
To stand and play the guitar, you need a strap that is securely fastened to both strap pins on the guitar (or otherwise tied to the guitar). Then you can stand in a normal way and check out how cool you look in the mirror with that guitar slung over your shoulders. You may need to adjust the strap to get the guitar at a comfortable playing height. Look again Tommy
Classical guitar technique, on the other hand, requires you to hold the instrument on your left leg, not on your right. This position puts the center of the guitar closer to the center of your body, making the instrument easier to play, especially with the left hand, because you can better execute the difficult fingerings of the classical-guitar music in that position.
You must also elevate the classical guitar, which you can do either by raising the left leg with a specially made guitar foot stool.
TIP OF THE WEEK
1) Your fingers learn by doing. Whatever they do, they remember and repeat. This is called Muscle Memory.
2) Practicing means knowing the right thing to do, and then making sure you do it. Your job, when you practice, is to make sure you understand what you're supposed to do before you play a note, and then make sure that is what actually happens when you do play a note. This is much easier said than done. This demands your absolute attention.
3) Your fingers are energized by Intention and Attention. This is how your mind tells them what to do.
4) We must be aware of the result we want, and the result we actually get. We must not let blind spots become part of our practicing. We must then treat every 'unwanted result" as an effect whose cause must be discovered.
5) We must watch our fingers most of the time while practicing.
6) It is essential to spend a good amount of time doing No Tempo Practice. This means you are playing with no beat, only examining each movement as it takes place, and making sure only the correct movements occur. While doing this, you will become aware of the stress points that occur in the music, that is, the movements that are causing you the most unnecessary muscle tension, and therefore the most difficulty.
7) Posing, along with No Tempo Practice, will train, or re-train the muscles to perform the required movements with no harmful tension. As stress points are discovered by observing and analyzing unwanted results, we use Posing and No Tempo practice to 'de-stress" these points.
8) As your understanding of guitar technique advances, you will know what to do about each one of these stress points. In the beginning, you must rely on the guidance of your teacher.
9) The techniques of Posing and No Tempo Practice are the best ways to deal with extra tension, because they are themselves the practice of becoming aware of the tension. You can eliminate a great deal, of tension from the muscles simply by being aware of how they feel, and consciously relaxing them as you do your slow and no tempo practice.