Hecate: when you write the spell you are going to cast you have to treat your desire as a concept and just split it in dimensions and then variables.
When you split the concept you actually go in depth and see exactly what your desire means to you and how the Universe should change to fulfill your wish.
After that you make an affirmation for every of the variables, then you have all concept asserted.
At this point you only need to cast with adamant conviction your power within will bend the reality according to your utterance.