the hardest NP to do is the one you aren't prepared for. No kidding. We do approaches at an airport 20 miles south. A favorite is a VOR/DME approach with a 10 nm arc. So that gives a student about 5 minutes to brief an approach and set up before they hit the arc. Add wind and you get a real test of cockpit management.

Stay ahead of the aircraft by doing checklists, setting up before the approach, getting WX, etc. and you'll see the approaches are more or less the same.