It has been stated and confirmed that we could do anything in God's name. Jesus states that we could cast out demons in his name, this statement reveals to us how the devil has been defeated already. Its so simple to mention casting out demons but is the action really simple to practice?
I will say yes, only if you have surrender to jesus and you believe in him. Someone who has given his life to christ can cast out demons. This is because at the moment you confess jesus as your lord, you are superior to the devil , you have the life of God in you ans youre righteous in christ jesus.
Mark 16:17-18
KJV:And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues;
18:They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.
Always have it in mind that satan has no right to run anything in your life, this is because the one who lives in you is greater than he who lives in the world. You have received an authority from christ, recognise the power in that authority walk in it and live with the consciousness of what the name of christ represent .
When you are dealing with the devil, there is no cause for negotiation, cast him out and right at that moment he's out. (only if you can walk in his name)
Remeber that you are associated with God and the same nature of life that has been given to you through the rebirth of the spirit, you're far above pricipality and power and the rulers of the darkness of this world.
The bible states that you shall overcome the dragon by the blood of the lamb and by the word of your testimony.
This is an assurance that when you exercise your authory in christ, you will bring the devil under your feet and your father which is in even will be glorified.