The idea is that Manifestation is an alchemy - has to be balanced in perfect flux of all areas necessary to be given from before being asked. All things require sacrifice. But if we "visualize" something to death without being naturally willing to make the changes - it is no more then a burden of information, and thus a burden of the flesh.
If you want something - be willing to give everything needed for it, whatever that might be. I find needs to be approached desirelessly, otherwise the pressure will create something monstrous from the negative energy pushed onto the topic in need of acquiring it. It has to be in perfect flux - a dance so perfect you hadn't known you were in a trance all along.
Attention, but not pretension.
