There’s nothing that can prepare you. Just take a deep breath, enjoy it, and don’t overprepare.
One piece of advice though: ask for help. Don’t be shy. Western culture prizes independence. This is not a time for independence. Ask the grandparents to help even if they don’t offer it. Pay for babysitting. Get lots of help. It takes a village is absolutely true!
(Oh and it’s absolutely ok to ask for help just so you can have fun)