This is a method I use to begin a ritual after I have cleansed it. It serves as both a method of clearing the energy from the space and to act as a ward from impostor spirits. It can be altered to go beyond just that space to banish energy or spirits from your home if need be. There are no tools beyond your mind and possibly your voice are needed, although you will need both meditation and visualization experience.
Sit quietly in the center of your space. Slowly, take a few deep breaths to calm your mind, using your diaphragm instead of relying on raising your chest. Keep doing this, focusing on each of your muscles relaxing as you grow deeper into the meditation. Shift your focus onto the black flame that burns within you (I find mine just above my stomach). Feel the warm flame within you, growing stronger with each enhale and rising with each exhale. Feel the power build as it rises, burning hotter and strengthened by your very being. Let it rise up your body, building in power and intensity as it goes up to your throat, them your mouth. Wait until you feel you cannot hold it, and when you are at that point, gentle blow it out. Allow the black flames to spill out of your mouth and onto the ground. Watch your black flames rise and slowly form a circle of flames as you exhale.
Feed the flames more power as you set your intention to consecrate the space for ritual and only allow who are true of themselves may enter it. Keep going until the flames rise as high as you can see it, burning away what no longer serves you or is not welcome. See the ashes of what is no more disappear, leaving you with a clean space to begin your work.
For cleansing of the house, simply see the flames spread beyond the circle, consuming all that does not serve you, becoming ash and blowing far away from your property. Continue until it feels as it is done.
Finish off by saying: “In the name of the God I am, my space is clean from the unwanted. As I have spoken, so it is.”