RMI tracking and intercepting, dip, and having the nerve to hold a heading while the needle is swinging over the beacon.
If you can crack the RMI thats a load of the IR done.
Lots of people bust on the ILS apparently, lulled into a false sense of security and worrying about the NDB in advance. Have the raw data in your bonce(ground speed times 5 equals ROD) so you can cross check the big picture with g/s, and ditto with drift on the localiser.
Dont forget to breathe.....good luck!!