Congrats.
The big change is priorities. You are not longer priority. Period. Kid doesnt care. Not for a while. You are now living around the childs schedule.
You can manipulate your childs habits to some extent but ultimately, its hit or miss and dont feel bad if it doesnt go the way you expect. I have 3 kids, all raised similar, totally different personalities and habits especially early life. They eventually normalized to something similar but it took years. They learn skills at different times and rates.
Realizations:
1 - You are no longer the master of your own schedule.
2 - Every child is different, dont assume anything.
3 - Do try to shape good habits but dont stress if it doesnt work.
4 - Your wife will have it much worse than you. Get over your gain problem.
Priorities:
1 - Just be there.
2 - If you are bread winner, this is 2nd highest priority, you must provide financial stability.
3 - Most women will have some depression for a myriad of reasons. If breastfeeding, it might be worse (though better for baby). Again, be there. Be kind.
4 - Majority of women will have some sort of physical problem from pregnancy.
Being a father is a privialage. It has ups and downs but the experiences are unforgettable. The kids will make you angry one minute, and laugh the next. They will do the stupidest things and make you wonder how human beings survived this long only to be followed up by a surprise behavior that makes you pound your chest like an ape in pride... "I did that." (LoL). You will lose a few IQ points while you listen to their play conversations then at 6 years they will beat you at Mortal Combat making you question your manhood... then you spend the next 4 hours polishing up your skills to make sure it doesnt happen again... only to lose again when they figure out how to camp you once you are down and cheap shot you over and over with a single button click action while jumping up and down on the couch and laughing hysterically in your face...
Congrats again.