the best way to think of it is that the pitch curve is your primary adjustment that affects the heli's personality, where as the throttle curve's only job is to hold the headspeed (rpm) constant at all times. ie: you play with pitch, then you tune the throttle curve to suit that pitch curve (always in that order). of course if you have a governor, a throttle curve is not needed.

the best way to go about adjusting both curves is to start with a baseline pitch curve. acceptable baseline curves for blades would be -6,4,+10 degrees in normal mode and -12,0,+12 degrees in idl1. once your pitch is set, adjust your throttle curve so the headspeed stays constant at every point.

to tune the throttle curve, i found it easiest to focus on one point at a time. start by getting your headspeed right at hover (around center throttle, or point 3 on a 5-point curve). then focus on the next point, lets say the one above hover, point 4, or 3/4 stick. get in a smooth hover, then move the stick to point 4 and hold it there. if there was a drop in headspeed, increase the throttle on point 4. if there was an increase in headspeed, drop the thottle a few % at point 4. repeat this excercise until there is no change in headspeed when you move between points 3 & 4. now work your way to the next point, and so on until you're done. keep in mind that setting point 4 before point 5 is easier, otherwise the headspeed will be less smooth transitioning in to 5. the same goes for points 1 and 2, start with point 2 first, then adjust point 1. when you're done, the rpm should hold constant throughout the collective range (limited by motor power of course, see my note on headspeed below).

tuning your throttle curve to match a pitch curve is the easy part, the hard part is choosing a pitch curve that suits your personal taste. ppl who hover a lot or do scale stuff usually like the results of flattening their pitch curves around hover. when ppl fly aerobatics, they often want a more linear response from the heli, so they will tweak their pitch curves to accomplish that.

to recap: you pick a headspeed, then play with pitch, knowing that if you change pitch at any point on the curve, the corresponding point on the throttle curve will also need adjustment to keep a constant headspeed.

a note on headspeed, the max headspeed will be limited by the capabilities of your motor. the stock brushed main motor will not be able to maintain a high headspeed and will bog down above roughly 8degrees, however with 3S lipo packs the rotor usually will continue to provide additional lift up to +12 degrees pitch. so i like to keep 12degrees in my programs for max lift with a stock motor.