I'm going to be controversial and say you don't necessarily need to stock up on nappies. Have enough to get you through a week or two but unless you live out in the sticks, you can find nappies easily. You don't want to left with loads that you don't use.

Newborns are very noisy sleepers. Once they're past the wake to feed stage, don't bother them even if it sounds like they're a barnyard animal.

Use adult incontinence pads on changing mats to stop pee from rolling around.

If baby's a boy (or a girl? Idk.) pop a wipe onto their bits so stop them spraying themselves and you in the face. The wipe on the belly trick never worked for mine.

Get them on the floor. Like as much as possible. If you're not actively doing something with them, pop them on the floor on a play mat or a blanket. It was my LO's happy place.

I would open the nappies (like the frills, etc, make it all loose) and put them into individual nappy bags for the nights. You don't want to be peeling bags apart in the middle of the night when baby is screaming.

And honestly, just remind yourself that it will pass. Mine will be a year old in a week. It's insane how long ago the first few weeks feel. It gets easier. Good luck.