matador_24 , hey its been a while since i heard from you, hope all is well. You know the best way i found to practice is get high, have the heli at a 9 or 3 o'clock position, make sure you are in forward speed then dump the throttle. If you have a couple of neg degree on pitch it will fall quite fast but that's ok, keeping the forward speed is a must. As you get close to the ground start pulling back on the cyclic until the heli comes to a stops which in the ideal word would be just high enough that the tail doesn't strike the ground. Once stopped and in combination of stopping increase pitch AND throttle to hover. At this stage it is important to not hit the throttle hold as you will want to recover to hover with power. Once the technique is mastered you can then hit the throttle hold. They are a little scary to start with as it will fall fast, but if you do it every pack it will become easy in time and no problem at all.

The rpm of the blades in an auto situation is determined by the negative degree of pitch on blades and the speed the heli is falling, not initial rpm.