words of encouragement please

I'm a 18 year old single mom. My baby was born 3 months early & has been in NICU for 2 months. Tonight is her last night. I'm terrified of bringing her home. What if I mess up? What if I sleep too hard to hear her cry? What if she pukes & chokes? What if she's not swaddled good & gets cold? There's just so much I could do wrong. I'm happy but at the same time I'm terrified. I can't do this by myself