Polyglot Julio César Aragón talks about his journey learning over 8 languages. In doing so, Julio answers two important questions:
1) How can you not mix up your languages, especially when they are similar? (1:04)
2) How can you learn a language entirely on your own? (5:55)
Julio's YouTube channel: http://www.youtube.com/Mexicanpolyglot91
Lingholic: http://www.lingholic.com/