I haven't flown Pattern yet, but flown IMAC off-and-on over the years (Sportsman, equavilant to Intermediate in Pattern I suppose).

I try to practice the sequences enough so that I don't have to depend on my caller. For one thing, you may not always get the same caller (if your caller competes too, can't make it to the event, whatever). After becoming familiar with the sequence I learn on my own how big, how high and how far out/in to position the plane to prepare for the next maneuver. A good IMAC (and Pattern I suppose) sequence will position the plane where it should be for the next maneuver.

On the other hand, if I get a caller who is really good, like a guy who flies up a class (or two or three) than me, I'll welcome his kibitzing.

In the end, I don't think you can or always should depend on your caller because you may not always get the same person and I would think you should be familiar enough with the sequence that you should know where to position the plane for each maneuver without any assistance. In fact, you should know the routine well enough so that if your caller makes a mistake (which I've seen happen more than once!) you should know to disregard the call without skipping a beat.

Tim