I think that 4-8 week range is the toughest. The sleep deprivation is starting to catch up to you, the baby is more alert, which in a lot of cases makes things worse, because their little nervous systems aren't developed enough to handle the stimulation. The snuggling/reading/tummy time stuff will be much easier and more fun for you both starting around the 12 week mark. Until then, to me, it's all about survival mode. If she likes walking around, do that. If she wants to sleep while you hold her, do that.
To me the hardest part of being a first time mom is that you think this phase is never going to end, or that you are doing something wrong. Take it from those of us who have been there, it will get better over the next few weeks. Just when you think you can't take it anymore
All of that is not to say that there aren't some techniques that help. I haven't made it all the way through HBOTB, but everyone seems to swear by it, so I'm reading it in anticipation of going through all of this again when DD gets here. And I'm sure others will have some great suggestions.
Hang in there! And vent to us here anytime!
DS - Feb 2010
DD - May 2012