I've got 2, 9 months and 4 and a half. Like others have said, you're never ready for your first kid. It's an experience that is really unlike anything else and it teaches you a lot about who you are and what your human nature is like. I always thought I was a patient and understanding human being, but my son really taught me otherwise. I'd see myself losing a bit of control and reacting to things in ways I was unfamiliar with, and it really forced me to confront some aspects of my personality that I did not like. I've learned to be a better person, and now I'm much more able to be who I thought I was before my son was born as I've grown with him these past 4 years. I already know I will be a much better parent to my daughter as we go through the same developmental stages that I've already been through with my son, and it's definitely not because I love her more or anything, I just know more about myself and what it means to be a parent now than I did 4 years ago.
It is amazing to watch a baby become a toddler, and a toddler become a small child. I really can't imagine what it'll be like when my son is 8, or 12, or 18, but watching him develop has been an experience I will always cherish and I am so excited to see who he continues to become. You will make mistakes, and probably do a couple things that you regret after the fact. Just keep an open mind and try to learn from your experiences so that you can be better next time. Take some time for yourself as you're able to and be understanding of what your partner is going through. When my son was first born, I'd hold him at night to let my wife sleep and play on my 3DS. I've always managed to find some time to play games, which is pretty much my only hobby. Like others have said, it has mostly come when everyone else is asleep but I'm pretty excited to start playing games with my son too
My wife is not, but she knows this is not a battle she can win! Just always remember to take a step back and try to enjoy the journey, it happens fast and things I thought I'd never forget (my son's first word, his first real food) I now find myself struggling to recall.