Bottom line, the fact is that Jesus Christ has already defeated all of our enemies. After all, the first ministry he performed was casting out "The Legion".
Lean on Jesus
Let it be more of Him(Jesus) and less or none of you. All evil spirits must flee at the name Jesus Christ. Jesus has already won. The enemy will leave if the Host is willing to shed them in Jesus Christ name. Often times, you have to teach the afflicted how to repent and seperate themselfs from the sin that allows the enemy in.
Shut the Doorways
The evil spirits are getting in through doorways or pathways. Repenting is to try not to commit the Sin that allowed the Enemy in. For instance, a sex spirit is very violent and will bruise their heads. He may implant a message/dream/vision in their heads. Best thing to do is to get the afflicted to recognize that they are being attacked and to praise Jesus Christ for his Victory.
Remove the Enemies Tools
When the enemy leaves, often they leave evil tools behind. Let them take it with them when they exit. Ask Jesus to fill those empty spots with Holyness and Gods tools.
Pray for the Afflicted
After you are done with the session, continue to pray agaist the Dark Powers and Principalities in Jesus Christ name.