I'd clarify, that for me, instrument was only hard, if you want to use that term, because there are lots of steps in the procedures you use to fly. Not hard, but the most to do. The ride is really all about the next 2 things you are going to do. If you are comfortable being in the system, and thinking ahead, the ride isn't all that hard. I only listed it as hard, compared to my Private and Commercial rides, which seemed more natural, since they are general knowledge tests, with the basic flying skill you have thrown in.
CFI takes everything you know, makes it possible to be in the test, then asks you to teach that topic, at whatever level the examiner asks for. And do that while you are flying. Can be done, just a little more patting your head, rubbing your tummy, chewing gum, and walking down the street at the same time compare to IFR flying for me. And to top it off, you get to see how it feels to drive on the other side of the pond, over in the UK, as you get to fly from the wrong side of the plane.