4 weeks left and so nervous

So I have 4 weeks left of maternity leave and I am just so nervous to go back to work. My parents and in laws will be watching him and my husband only works 3 days a week so its not the leaving him with someone else that is making me nervous. What's making me nervous is the getting into a routine, the no sleep, and having to be at the top of my game 9 hours a day 5 days a week. My husband will be able to help a lot but on the days where he works 12+ hours it's just me getting both of us together and out the door. If it's a 3-4 hour sleep night or less, I'm honestly scared to even get in the car and drive with my baby let alone be super high functioning at my job. Right now the some what routine we have is not even feasible when I go back to work. I feel like I should start preparing now routine wise but how do you get a 5 week old on a schedule? Any tips from you ladies who have started back to work are greatly appreciated!

A picture of my baby boy Hunter Riley