Listen to all the advice you're offered, then sift through and choose the bits you want to listen to, and let the rest just wash over you.
A good thermometer will be reassuring, but you can tell if a baby has a temperature, just give them a kiss on the head. You'll learn the difference between normal and fever quite quickly.
Cuddle cuddle cuddle. For the first few months that is the main thing your baby needs from you, you can never cuddle them too much. But if it's getting too much for you, pass them over to dad if you can, you're allowed to look after your own needs too.
Everything will now take twice as long. You will feel better about things if you adjust your expectations and accept the slower pace of life for a while.
Pack at least one full outfit change for baby in the changing bag. If you can, pop in a spare top for you too.
If you feel very down, very anxious, overwhelmed, or like you just can't cope, talk to someone. Its one of the hardest conversations you might have, but after the first time it gets easier to discuss it. Pnd affects thousands of mums, and is manageable and treatable. You don't have to suffer it. Even in the current medical situation, pnd is something that must be treated. For me it felt like being trapped at the bottom of a black well, or like everything I was doing was wrong, or that I couldn't stop my mind racing. It's different for others. But dont let it go untreated. If you need help, ask for it.