It's okay for your kids to see you make mistakes. Own up to them; those are teachable moments.
Take your definition of exhaustion and multiply it by 5. You will feel this at the end of the day.
Your days of sleeping in will soon be over.
Research basic illnesses, symptoms and treatment. You'll need
Parenting will be a lot like a roller coaster.
Most of your "needs" will become "wants".
Pay attention to details during your kids' transitional periods. There's no turning back the hands of time.
Handprints are treasures.
Take lots of pictures.
You don't know what you're doing, but there's a pretty big learning curve.