Timing plays a big role in Witchcraft, Spellcasting and Ritual. The better timed the work or event, the better it will work.
Full Moon Ritual should be done the night before or the night of the full Moon. Sabbats should be celebrated on the Sabbat Quarter or Crossquarter, not on the chosen day on the Calendar.
An example would be the upcoming Sabbat of Beltane. Some call it "May Day" and celebrate it on May 1st. I will celebrate it on May 5th, which is the Beltane Crossquarter day, when the Sun reaches 15 degrees of Taurus. (Just for the record, this year, Beltane is on a Full Moon and on Cinco de Mayo.)
Spells for releasing bad habits should be timed for the Waning Moon, which is when the Moon has gone through the third quarter and is between the fourth quarter and the New or Dark Moon.
Spells for increase, as in Money spells or Abundance Spells should be performed and timed when the Moon is nearly full or full, when the Power is the greatest for increase.
Timing is everything, and there are many more ways to time Spells and Rituals, and more will follow soon.