You need to look into how The Orthodox Church deals with this. I am not an expert.
I know that these exorcism are always read by the priest. Those who are exorcised need to fast and confess, otherwise the curses do not work. I don't think it has to do with scaring demons because they don't really get scared. It has to do with the fact that The Lord gave us power over Satan. The priest basically orders the demons to leave just like Christ did. As always, we need to stay away from literally fighting with demons and being hateful towards them; this will call them even more, not send them away. It's all about the power that God gave us, the way we repent (our purity), the power of The Cross (symbol of God's love and sacrifice), etc. The Orthodox Church does not believe in violence and hate, even towards demons. We hate their condition, their sin, but not themselves.
I am no expert on this, but it seems to me what Jesus said to the disciples was that it was them who had to fast and pray,and have more faith to have the ability to cast out Demons.
The Healing of a Boy With a Demon
14When they came to the crowd, a man approached Jesus and knelt before him. 15“Lord, have mercy on my son,” he said. “He has seizures and is suffering greatly. He often falls into the fire or into the water. 16I brought him to your disciples, but they could not heal him.”
17“O unbelieving and perverse generation,” Jesus replied, “how long shall I stay with you? How long shall I put up with you? Bring the boy here to me.” 18Jesus rebuked the demon, and it came out of the boy, and he was healed from that moment.
19Then the disciples came to Jesus in private and asked, “Why couldn’t we drive it out?”
20He replied, “Because you have so little faith. I tell you the truth, if you have faith as small as a mustard seed, you can say to this mountain, ‘Move from here to there’ and it will move. Nothing will be impossible for you.a”
22When they came together in Galilee, he said to them, “The Son of Man is going to be betrayed into the hands of men. 23They will kill him, and on the third day he will be raised to life.” And the disciples were filled with grief.