I'm about to do something very stupid

Very well. In your original post, you said something along the lines of "I should be the ruler of everyone's life. Those tasks should be left to me." This is a paraphrased quote from the best of my memory, and I realize for a paraphrased quote as long as I state the original author (GravitonSurge) that I need not include quotation marks, but for the sake of simplicity they will be utilized here.
Now on to your post. When you say, "those tasks" that is referencing to a set of two (or more) tasks that you did not explain fully in a previous dependent sentence or clause.

Correct me if I'm wrong. I am certainly not an English major. I just have a very strict British professor for English.

Edit:

For comparison, it would be like starting a conversation with someone in the middle of a sentence. For instance, if I were to approach you at work as your supervisor and say, "those kind of situations are not appropiate in the work place," and walked off leaving you to ponder what situations I was talking about.