Now look at the way the strings pass over the nut by the headstock. The strings should be very close to the fretboard, less than one millimeter. This is difficult for most people to measure so you will just have to be your own judge on this, however, if the strings are too high here, it will also make the guitar more difficult to play.

With a little training anybody can learn how to adjust their guitars action, however, there are a number of different causes for high or low action, so it is recommended to take the guitar to a reputable guitar service center and have it adjusted if you believe the guitar needs it. This will not be very expensive and you will be glad you went to the effort because the guitar will be much easier to play when the action has been adjusted properly.