> I want to be able to finish a task fully without missing or skipping a step. One way to do this is to make a plan for everything you do, and only do that thing. Nothing else.

True. Also don't overthink during the planning stage. And you need to understand that the reason you freeze / abandon and not complete something is because of anxiety (which triggers avoidance). For example, for perfectionists it is the strain of the high standards they demand from themselves and the hidden fear of judgement that drives this.