A few days before the ritual, you should copy the following prayers in your notebook, with the Chinese ink and read them several time so to familiarise with them. The day before, check the position of the moon in the sky.
The same day as the ritual but largely before, take a shower and put on light cloths. Stay barefoot.
Do some relaxation and chase any negative thought of resentment, reproach or anxiety. Do not begin until you are confident, calm and serene.