ILS approaches are among the easiest elements in IFR flying. Think about it. Aren't they all the same? Don't they all dump you off at the end of the runway in perfect position to land? What could be easier? What do you have do do different to fly one in NYC or BFE? Once you master the head-tapping belly-rubbing routine, you can perform it in any airspace as well as at weddings, bar mitzvahs and county fairs.
Non-precision approaches are much more difficult because, well, they are non-precision and lack the neat stuff that spits you out over the numbers.
Truth be known, none of the approaches that scare the newb's (because the haven't done enough of them to know there's nothing to it) are even a blip on the radar at hallowed halls where the hard separatin-the-men-from-the-boys work of flying in shlttyweather is done. The real work is figuring out what's really out there that can cause you to have a much more interesting day that you're mentally signed up for, and whether you and the airplane are up to the task. Once those brain cells are assigned to the task, you just gotta be sure they stay aodused up, you don't need a bunch more to do the necessary yanking and banking to get where youre going.