My daughter is two will be three soon. What you need us to sit back and enjoy every minute of it. It goes by so fast you won't believe it, seems like we just brought her home and now I'm sitting here eating cupcakes with her after dinner.
It will be hard you will be tired, stressed, and exhausted but you get used to it a little after awhile. You will want nothing more than to sleep when the little one cries or its time for a feeding but tell the wife you got it. Not only will you get brownie pints with her its like a special little time just the two of you in the middle of the night.
Also be patient your wife might seem a little crazy for awhile and she probably is,its the hormones and mine new she was acting crazy but couldn't really help it.
Just remember when you are exhausted and stressed just take a deep breathe and enjoy it. It really does go faster than you could ever imagine.