1. Take It Slow
One of the major causes of frustration for beginner and intermediate guitar players is that they try to play things too fast. In the beginning stages of development, a guitarist needs to practice at very slow tempos to allow the brain time to process the information. Remember, speed is a byproduct of consistent and efficient practice. In the beginning you need to focus on playing things correctly, so be patient and the speed will come naturally.
2. Avoid Feeling Overwhelmed
For beginning students it can be very easy to feel overwhelmed with all of the new information and practice concepts being introduced. They are usually under the misconception that they must review absolutely everything they are working on for every practice session. This can be extremely overwhelming and frustrating and cause a lot of anxiety when it comes time to practice. Beginners need to keep there practice sessions short and simple. Remember to only work on one topic for each practice session and spread the remaining materials over multiple practice sessions.
3. Don't Worry About Everything You Don't Know Yet
This is a very common problem for intermediate guitarists. As an Intermediate player, you are just starting to put the pieces together and set goals for yourself as guitar player and as a musician. As you start to explore your interests, you immediately realize that there is a great deal about the guitar that you have not yet learned. This can be very frustrating and cause you to forget about everything that you have accomplished so far. During this time it helps to focus on the positive and remember that even though there is so much you haven't learned yet, there is still a lot for you to be proud of.
4. When All Else Fails, Find Something Fun To Play
There comes a time in all guitarists' lives where they encounter something that just doesn't click for them. You sit and spend countless hours of practice time trying to master a new technique or song and no matter what you do, you just can't seem to get the hang of it. When you encounter one of these road blocks, you must remember not to force the issue. Frustrated practice yields poor results and only leads to more frustration. Instead, find something fun to play that you are already good at. Put the other thing out of your mind and come back to it another time. Play to your strenghts and build your confidence as a guitarist, and everything else will take care of itself.