Hit the books, Every helicopter handles a little differently than another, From Low Gross weight/High gross, Air speed and all the other stuff that you take in account for a safe flight. From the little R-22, and the Hughes 269 to the S-58. If you are flying with such a gap in knowlage required that you are asking a Forum a question "Why aft cyclic in the start of an autorotation" Get your money back from that "Instructor". What you don't know will kill you. Learn & live.