Your old life is over. A new one awaits. It will most likely be better, but no doubt different.

Relationship: don't keep a (mental) score of changed diapers, chores etc. with your spouse. You're not roommates. Team work isn't perfectly balanced or symmetrical.

You: Everything is just a phase and will soon pass. Remember this, when things are tough. Also, don't be confused if the first months feel more like a struggle than the most magical period. In the beginning they're more a "generic baby", which may or may not be your thing. After 4–6 months, they'll have developed a little more personality and you will fall in love with that person.

Parenting: Positive reinforcement. Overflow them with love. Try to teach them nice manners from the very start (greeting people, thanking etc). Everything in life is easier with a likeable person.