I do the majority of my work with the Full Moon, as I hold solitary Esbat celebrations. However, if there is something that should come up after the moon has waxed to Full but not yet waned to New then I will perform any necessary workings with the New Moon. I do very little work with the waxing or waning phases, honestly, but if the need arises I prefer to work with either the Waxing Gibbous Moon, or the Last Quarter Moon. Sometimes an issue can't wait for too long, so we do the best we can.
Lately I've begun to consider how I might also hold an Esbat during the New Moon in honor and worship of the Goddess as Dark Mother/Crone; as of yet I'm still in the early stages of ritual composition.
I work with all the moon phases depending on the ritual, and if a ritual needs to be done in a pinch I adapt it to the specific moon phase that is happening overhead for instance if I am working for health if it happens to be a waning moon, banishing and dissipating illness is how I would adapt it. I don't let the moon phase get in the way of a ritual that is needed in a pinch. I do however work for gains during the waxing, work for diminishing during the waning. Full and Dark moons I do specific Esbat rituals. And the New moon is for any spells or rituals that are intended for bringing something new into my life.
For the last few years, the dark moon and waning moon have been very significant for my practice, I often work with banishing and getting rid of all the old stuff that is no longer serving me, I also find that my psychic flow is more fluid during the waning and dark phase for some reason.
nice thread you have going here!
I can't work at all around Dark (New) Moon as a rule as I find it leaves me feeling as much use as a chocolate tea pot and flatter than road kill.
On the other hand, Full Moon is usually a time of real enthusiasm and great personal empowerment for me, so I tend to focus all my important tasks during my Esbats then.