I suppose in a literal sense it would involve some heavy equipment, a relatively large crew, planning, co-ordination and enough time to make it happen, but in a figurative sense it seems “moving the goal posts” is comparatively simpler — at least it feels that way.
Moving the goalposts (or shifting the goalposts) is a metaphor, derived from goal-based sports, that means to change the criterion (goal) of a process or competition while it is still in progress, in such a way that the new goal offers one side an intentional advantage or disadvantage. (Wikipedia)
A situation that is frustrating to be sure.
Although I will say, its cousin “Moving the goalposts while the ball is in the air” will bring the toughest to a knee (sometimes pounding the ground and uttering those icon words, “Damn you, damn you all to hell.”). In this case it’s all about chronology, the goalposts get moved after you have initiated the activity(s) to meet the goal — you kicked the ball, it’s in the air, it’s on target… and then the goal posts get moved. Incredibly frustrating for the kicker (and her team), figuratively speaking.
There is no commentary regarding how to stop this from happening — the world is a dynamic place; something it will always be. The posts will move because someone wasn’t thinking, deliberately wanted to shift the posts for their advantage, lacked an appreciation their actions would impact what you are doing, had to react to a situation outside everyone’s control, et cetera, et cetera. It’s simply a truism that the posts will move; not always, but more than you would like.
Stay aware, over communicate and validate what you are doing will still achieve your goal, and as they say, never assume. And if the ball is in the air when those goal posts move there are two options that come to mind — figure our how to kick another ball very, very quickly, or figure out where the ball will land, have a plan to pick it up, and kick it through the posts before they move on you again. And remember, even if you miss scoring, you have still progressed the ball, and that’s the most important thing,
All figuratively speaking of course.