Tuning a guitar without using a guitar tuner is a very easy task.  There are several methods that may be used for guitar tuning.  However , for newbs it is advised to user a chromatic tuner for tuning your guitar as you are in the first stage of understanding the different guitar sounds which need to be accurate.  

Tuning the Guitar - the fundamentals

If you’re a noob in playing the guitar, you need to tune up the guitar to standard tones.  The six strings need to be set to the standard E, A, D, G, B, E pattern of tones.  

Alternate ways to Tune a Guitar By Ear

A Web Guitar Tuner

If you do not have a chromatic tuner, you may use your computer and speakers for online tuning.  This is one guitar tuning method using the ear.  There are lots of websites which provide online tuning facility.  Simply go to any such website, choose the tuner, click on any of the six strings shown on the PC monitor, listen to the sound correctly, and start tuning the same string on your guitar.  

A Keyboard

If you are thinking the easiest way to tune a guitar by ear, using the keyboard or piano is another good method.  Play a note on the keyboard, listen to the sound with concentration, and tune the specific string on the guitar to the note that is being played.  For checking if the guitar is in tune , you can play a chord on the keyboard and then on the guitar and check for any sound diversifications.  

A Song

A song may also be used for tuning the guitar.  But for this type of tuning by ear, you should be certain about a song being in a selected universal scale.  If you are certain that the tune is in a particular universal note, play that song and tune any of the guitar strings.  After your get the universal tone on any one of the guitar strings, you can tune the remainder of the strings accordingly .  It is better to select a song that’s in the note which can be played open on any of the guitar strings.  An example will make you better understand.  If you are sure that the song is in the  ‘E major’ chord, play that song, and tune the 1st or the sixth string to that major note of that song.  After you get the  ‘E’ note on the guitar, you can then tune the rest of the strings simply.  

Be sure to go to his really popular website on best way to learn guitar and come across good guides regarding ONLINE GUITAR LESSONS FOR CHILDREN