You will feel like your flow is weird when you are practicing, I practiced with a buddy and we always were worried when we did the CPNE it would feel awkward and staged but it didn't, it was a great weekend!
You cannot really plan how you will attack your assessments until you get in there, you can kind of make a strategy in your head but you never know what kind of interruptions will pop up.
I used a grid and I stuck to it! It saved my butt a few times. I did the 20 min check right away and usually vitals and then declared them and got them out of the way. Then just took it from there, once you are with the patient it flows naturally, atleast I felt like it did, they know you are there taking an exam too and they want you to do good :-)
Remember these people are in the hospital, so they will be getting a tray, physical therapy, family visitors, nurses and techs, respiratory treatments, they may have to go potty or even better potty in the bed, you just never know. Go with the flow, be confident and think like an RN--they want to see you in control under pressure.
Good luck!!! :-)