A lot of what you write here is gramatically correct, but doesn't flow very well. I'll try to make some suggestions below. Again, a lot of your writing is technically correct, but most of what I'm going to add will help make it flow better and, I hope, sound more accurate:

Easy Steps to Playing Guitar

Isn't it wonderful is to appreciate a well-played insturment? It is common to think that those talented musicians began practicing since they were pretty young, and that it is quite (perhaps you mean "only" here, as in it's "only possible to be good" I'm not sure) possible to be good at an instrument if a person begins playing since the childhood. If you hear a talented musician, it is very possible to believe that he or she had started to play since at an early age. But it is never too late to start a new instrument; for instance, look at how easy it is to start to play one of the most popular instruments: the guitar.

If you want to learn how to play the guitar, the first step of course is to buy one guitar. It is not necessary to buy an expensive one at first. A good clue is to start with a guitar with nylon strings. There are two reasons for that: For one it is way cheaper than the steel string guitars. And it is easier to play because the nylon strings are easier on the fingers, both for notes and for strumming chords. 

The second step that is recommended is to look for a good guitar instructor. It is essential to have a theoretical basis of the instrument. It is like someone traveling to a place that he or she does not know how to get to without a map. It is almost impossible to get to the destination without instructions. With an instructor, the new guitar student learns about the instrument itself, about musical styles, harmony and much more.

The last step is simple: practice! In fact it is not that simple, though it is extremely necessary. With guitar classes, the learner has exercises that are passed by the instructor. In addition a way of practicing that people use a lot nowadays is the Internet. It is possible to find and research chords and tabs from different artists and bands. And in playing the songs that he or she likes, it becomes an important impetus for learning the instrument.

Here are the first steps again: Get a guitar, to look for a good instructor and to practice. Naturally the more the learner improves on the instrument the more steps he or she will find. Learning a new instrument is a wonderful experience, and it is never too late to do it.