I think your post really defines Faith--waiting in anticipation for something you believe in fully, yet isn't tangible or concrete.  I had probably the same book while I was pregnant and I love that it took the unknown and made it clear and real for me--this week expect this to happen, this week expect this and so on.  It took some of my fear away and allowed me to be more relaxed and excited.  I sometimes wish there was a similar manual for living--if you take this particular step, expect this to happen, and so on.....Although I am sometimes so out of the box that if there was a manual I'd probably have my own take on following it:)
I love Advent.  In the midst of the hustle and bustle of holiday preparations, I love the Advent calendar and calendars and celebrations that all remind me what the true celebration is all about.