There is nothing to be afraid of. We have not lost a deliveree in twenty years of ministry. Demons are like air. They are usually expelled by the exhaling of breath. This can be by yawning, coughing, deep breathing or gentle exhaling of breath.
Demons can have nests in the body which have substance.
They are usually expelled by blowing the nose, coughing up phlegm or vomiting. Don't feel bad when this happens. For instance, it is beautiful to see a cancer vomited out of a person during deliverance. Paper towels and waste cans are provided for this reason. Demons can temporarily take over your body and manifest their characteristics.