When the Lynx first came in with BERP blades, every auto was major excursion into some corner of the Nr envelope. Eventually the accelerative Nr nature became more familiar and you soon learned to control Nr with judicious use of the collective. The point being there was no magic collective setting, you worked fast and furious at keeping everything in the governed range on the way down. It's should be the same for every helicopter, you enter autos in the prescribed manner and keep the Nr in the governed range through use of the collective, plus of course whatever you might want to be doing with the cyclic to get your speed/field/flare sorted out at the bottom.
I am perplexed by this "here's what you do with the controls" approach to an auto. There is no fixed solution, just the one that saves your life on the day. But as SASLess has mentioned, without Nr you have no vote or input in the subsequent events, so you really should get that sorted out at the start - assuming you aren't prevented from doing so by some other malfunction.