The key to learning the guitar fast is to, wait for it... play the guitar! A good guitar teacher will help structure your learning and goals along the way. "Practise" sounds boring, but it doesn't have to be! All practise is, is instructing your brain to wire itself in a certain way. And there's a lot for it to learn: from how to hold the guitar, to how to get a nice sound, to how to read music, to how to express yourself. Practise needs to be regular, but it doesn't need to be long. Beginners can achieve a lot in a week, if they put in 20 minutes a day. Slow practice is the key to becoming a virtuoso! Slow practice means you wire up your brain correctly first time.