The book contains the famous Gary Player quote. When accused of being lucky he agreed, with "and the harder I practise, the luckier I get." Practice really does make perfect.
Not all business books are helpful, but most will bring at least a couple of nuggets and another contained in this one is "You cannot bore someone into saying 'yes'." I've always been convinced that passion is key and you have to do something which makes you happy to kick off the duvet every morning. Otherwise, why bother? If you're bored, you'll come across as bored. And that's never going to win.