Congratulations. I remember when my first was born. The drive home from the hospital was a very slow one. I was afraid to hit any bumps lest I wake the little guy. It was also very very weird that first night back home. Especially those first couple quiet hours before I realized I forgot to bring home the owner's manual.
But honestly it's a great thing and you'll adapt and find different ways to do things. Just make sure you take time for yourself now and again and doublely give some time to your significant. She'll be needing it too, er more so.