RhiSabelle, I am sorry, but this is utterly wrong. I do not know what kind of theories you are following, but they would be weak ones and not meet reality at all. If this is your wisdom, then it was by pure luck in the past, that some of your spells were successful if at all.
Maybe some human beings have some small powers, but this is nothing compared to others that exist! (Some would call it powers of spirits, nature, gods, whatsoever). Whatever we do, whenever we do, we are always behaving in a context, in situations, circumstances,... and are yet the weakest "power" to say so within this game. We are in constant interaction with the universe, nature and beings around us, although you might not be able to feel it. And in everything we are doing we are so much influenced by and depending on other powers way way stronger than we are. And this is, why there are more favourable moments to do spells than others. And nature can sometimes be an indication whether something is on good terms or not.
Your belief that you can just do some spell of whose success is only depending on your personal form and will is something between arrogant and ridiculous. Let's be honest, you have no clue of what is there and what we are embedded in.