YOU SAID:

stringing guitars are playing by themselves

INTO JAPANESE

弦を弾くギターは自分で演奏している

BACK INTO ENGLISH

I play guitar myself playing strings

INTO JAPANESE

私はギターを弾いています自分で弦を弾いています

BACK INTO ENGLISH

I am playing the guitar I am playing the strings myself

INTO JAPANESE

私はギターを弾いています私は自分で弦を弾いています

BACK INTO ENGLISH

I am playing the guitar I am playing the strings myself