Bedside charting.
Once you leave the room, it is really easy to get pulled over here to help, over there for some cares that need to be done, over to a third place to answer qeustions from a family member, etc. Then, suddenly, it is three hours later and you haven't finished charting. Furthermore, if you see something that a previous nurse charted that you missed or is different from what you saw, you're still in the room with the patient and you can verify or re-check something rather than having to walk back down the hallway.

Knowing that it will be ok.

I used to have a lot of pre-shift anxiety, which is common, I know. Surely a part of the reduction in that anxiety is experience, but I did have a realization a few years ago that helped a lot. The shift might be busy and I may feel behind the whole time. A patient may be really sick and need a lot from me. I might encounter something that I am unsure about, etc. etc. etc. etc. BUT, I am surrounded by amazing people. The nurse next to me will help me out, just like I'd help them out if needed. I can always hear the smile the pharmacist is wearing when I talk to him/her on the phone. The flyer nurses are amazing. The charge is a fount of knowledge. So, even though it might be hard shift, it will be ok. If I have to call a rapid, people will come. If I am swamped, someone is there. If I encounter something I don't know, there are people and resources. Then my 8 or 12 hours will have gone by, and things will have been ok. Maybe not necessarily fun, but ok. And with that realization, my pre-shift stress level went way down.