"Yes, you can work in your underwear, wake up at 11:00pm and drink beer all day if you want to.
But you shouldn’t."
YES YOU SHOULD. But not every day and only at the right moments. It depends on what you think of what is important. What is worth more to you. Your undies, or a pay check.
Trust your gut feeling and do networking. And if your gut feeling sucks and you think you are bad at networking... know how to deal with it or stop freelancing. You cannot apply a 'guide' like this to yourself. There are many many examples of successful (=happy?) people who do not apply this guide to their selves. Like me. I'm quite successful and happy! And do work in my underwear sometimes. And like to go kitesurfing in the middle of the week (and work my ass off in the weekend if necessary). I can make more money if I want to, but I dont. I prefer having fun, broaden my mind and sure do enjoy the freedom of being a freelancer!