cj-crafty, this is your first, right? I definitely remember having some of those mixed feelings. The "Crap, our easy life is over as we know it"... and I have a bit of it now, which is "This one kid is so easy to tote everywhere, it's going to be a lot harder with two." I think it's always an adjustment, and it's a little more difficult at the point you're at now because you have a lot of time to just wait and mull things over and sometimes mulling isn't all that productive.
Can you squeeze in a class that meets once or twice? Our first time around my husband wasn't willing to read much but he was willing to take the Bradley class, and I think it was helpful for both of us. By the end of the class we both knew the basics cold since we had been over them so many times and I felt much more secure that he would feel able to advocate for me during the birth, and I think he did very well. That's a 12-week class so it is a little late for that for you, but you could still do something less comprehensive.
Personally I am always kind of cautious about a pregnancy anyway. I know that getting two lines on a stick does not equate to having a live baby in your arms 9 months later. There are many steps along the way where it can go pear-shaped. Even though that is not super-likely and the likelihood continues to decrease as you go along, I still feel tentative about it until I actually have that take-home baby in my arms. I feel confident I'll be a lot more excited about it then.
We got our bunk beds delivered yesterday, so Daughter is in a big-kid bed now! She made the transition seamlessly; she's never seemed to really care much where she sleeps. I wanted to make sure we had some time before the baby was born, so she didn't feel possessive of the crib-turned-toddler-bed once we turn it back into a crib.