In this ritual you will be calling on Hecate in Her Crone aspect. It is performed during the Dark of the Moon. 

Begin by setting up your altar as you normally do for a ritual, making sure you have a black candle and wine or water in your chalice in addition to anything else you use. You will also need a cleansing, purifying incense and a censer or some kind of container which can be carried around your room. (I have a small censer with a chain that works well for this.)

It is best to set your altar on the floor for this rite, but you may do it however you feel most comfortable.

Cast your circle as you normally do.  When you are through, kneel before your altar and light the black candle.  With your arms held, palms upward, at your sides, call Hecate by saying three times:

"Hecate, beautiful Crone of Night
I call you here to put things right.
Transform the negative thought and pain
And help my life be whole again."

Close your eyes. When you feel the presence of Hecate and know she is there to help you, open your eyes. Bow your head to her to show your reverence, then take the chalice, saying:

Sip a small amount of the wine (or water), envisioning it as liquid energy, flowing to effect a positive change within and outside of you. Leave the rest as an offering to Hecate.

Light the purifying incense in the censer, cut a door in the Circle, and with your four pieces of black tourmaline (the stick kind) walk around your room placing the tourmaline at each of the four quarters.  (Use window cells and ledges behind furniture to hold the tourmaline).  As you do this say 

"As this incense purifies this area of all current negativity,
let these stones serve as a boundary to hold future negativity at bay"

Come back to your altar and begin to visualize a bright golden light filling your room. 

"Hecate, Lady of the Golden torch
Bring your clear light into my sight
Help me to know that the dark corners
of my mind are now purged
 by the illumination of your torch's golden glow"

Thank Hecate. Meditate if you wish, visualizing your life free from negative happenings and feelings and full of love, prosperity, and happiness. Feel how She has changed your home and your life. Close the Circle and know that it is done.