On the older Arrow's with the automatic gear extender or "magic hand" (which i've never heard of, but is pretty clever) there is an system override switch on the lower console by the flaps. You can basically turn off the automatic gear extender, so you can perform your stalls/slowflight etc in peace. I
About the power settings I agree with the above, but for Chandelles, I've always used climb power: 25'/2500 rpm. Not full throttle/prop.