"Developing a Plan" is one of the most problematic items in the newer terminology. It's more of a gist -- works in certain instances but not all. Use Conceptualizing instead.
The best way to get a feel for it is to think of that feeling you have when you open up a box of IKEA furniture and pull out the wordless instructions. You need to conceptualize the thing, piece together the weird images on the instructions to create an image / concept in your head, and yes, develop a plan to put it together.
In American Beauty, "life in suburbia" is like the IKEA box, and the instructions for it are just as vague. (and they realize that they've been putting together furniture in an uncomfortable, unfulfilling way their whole lives, and try to figure out how to do it differently, with tragic results)
So in your MC signpost, all those things relate to how others are trying to piece together or figure out what's really going on with the MC, and the MC trying to prevent them from getting that correct mental picture of things. Which also likely requires some conceptualizing or planing on the MC's part to throw them off.