Living by these guidelines is certainly easier said than done, but I'd be doing myself a disservice if I didn't try. The same goes for you.
If you listen to the contents of your internal dialogue, it is often a running description of the experience that you are actually living now. That is to say, you are continually telling yourself the story of your life, even though you are the one supposedly living it.
I won't pretend to sit here and know exactly how you should go about seizing the day and loving your sparkling, precious life. Only you know what thrills and depresses you, and so much of this comes from tapping the seriously-wise voice inside.