Becoming a mum!

My partner & I are ttc our first child... I'm very excited & happy about this! But I'm also really nervous and scared that I won't get everything right... I want to make sure I do every single thing right!!! 
But what if I don't know how to change my newborns nappy? What if I don't know how long to breastfeed for? I'm so scared that I'm going to make all these mistakes. What can I do to teach myself everything I need to know?