Hello, congrats!
I am a first time mum to a now three week old - so pregnancy and having a new born is the here and now for us.
Maternity leave, you will get a few days of intense nesting and then a perfectly reasonable amount of time doing nothing but naps, walks, tv box sets....
Use moisturiser! My skin got dry both at random intervals whilst pregnant and after baby arrived. (Also, drink pints and pints of water/dilute juice whilst breastfeeding if you do.)
Sleeping at the very end of pregnancy was worse for me than sleeping with a newborn (back ache and hourly pee trips vs feeding every two hours)
Ditto what PP said about having everything in arms reach whilst breastfeeding.
We didn't start breastfeeding until two weeks old and now he is a champ. The first few days aren't the be all and end all, use the midwives and breast feeding advisors!
Also TV box sets - good for late night or all day cluster feeds.
Take a tiny baby outfit to the hospital - our "8 pounder" turned out to be 6lbs 2oz.
You will cry. In pregnancy songs and adverts used to set me off. Now I'm a mama I spent the first three days a mixture of eurphoria and happy tears, then the baby blues came. It felt (and still very much feels) surreal to be so emotional.
Make sure you have someone you can be brutally honest and yourself with. I have put on a positive and happy exterior with everyone but my DP and mum. Those two I can cry and wail and go to when I need a cuddle.
A colicky baby will make you feel like crying. If you have a car, go for a drive - it saved us!
Obviously, these are just a few of the things we have learnt together, no doubt there will be thousands more before my baby gets to 3 months. 😄