Into your cauldron, place a large black votive candle.
On small pieces of paper write what you wish banished from your life, one banishment per paper; fold each paper once away from you.
When you are ready, light the candle inside the cauldron.
Now light one piece of paper in the flame of the candle and drop into the cauldron.
Keep going until all papers are gone.
There will be a lot of flame, so please use caution and make sure no flammables are nearby (i.e. curtains etc.).
In fact, it would be wise to keep a box of baking soda or salt near your work area (just in case).
Let the cauldron burn itself out; then clean when cool.