NADPs have nothing to do with autopilot, or altimeter settings, etc…
How you fly them is completely up to you as long as you comply with them. And it might be different for each operators. What you are describing is your company’s procedures (I guess).
NADP 1:
NADP 2:
Once again altitudes might differ by local regulations but these are the ICAO standards. Altitudes are AGL.