Life with a one month old is definitely different than life with a newborn, at least in my experience.
When my daughter was a newborn, she was easy. She ate every 3 hours and went right to sleep right away..
Now.. at one month old.. she's starting to think and starting to have preferences.. and she won't sleep right away.. she's definitely not as easy as she was as a newborn.
The lack of communication between she and I doesn't help either. Babies can't talk. They cry. And cry. And cry. I wish I could just know what she wanted, but I don't. That's the frustrating part. I wish each cry had a decoder so I knew exactly what she wanted, but I don't.
Getting her to go to sleep after being awake is difficult.. it's a series of guesses as to what position makes her most comfortable to be asleep.. sometimes it's holding her standing up, sometimes its putting her down in her sleeper.. sometimes it's holding her while on the rocking chair..
There is definitely a learning curve to motherhood.. there is no preparation for this at all..