'ksa' it may seem daunting what yr about to do but remember to get where you are now means you can already fly the plane so don't try to make it perfect first up, remember, AVIATE NAVIGATE & COMMUNICATE in that order. Lots of good advice here esspecially be prepared & as someone said SLOW the plane down if needed, nothing is ever that urgent when it comes to flying.
Also another hint if yr doing an NDB app for Eg on a sunny clear day under the hood at an AD that has multiple VFR traffic in the circuit get yr instructor/examiner to assist with the traffic as in get him to take note of who is where in & around the circuit area & even talk with them if needed. Why you may ask should you do that? Well if you where actually doing a fair dinkum NDB at this same AD meaning the wx is most likely crap then there wouldn't normally be that many VFR tarffic in numbers anyway. In other words CRM, yr instructor is in the cockpit USE him/her if needed
If during an App it doesn't feel right it usually means it isn't so bug out, make a missed approach, (good practice anyway) yr instructor would expect this if yr out of tollerances & it shows good cmd decisions early on.
At the end of the day remember an inst Approach is designed to get you visual so you can perhaps land. Don't start it (as in stay in the holding pattern if needed) until YOUR ready with the task at hand well sorted out before hand.
A saying..........."Chance favours the prepared mind"
CW
CW