A Michigan Exorcist

Though Christians do have power over satan and his demons this is usually a misunderstood concept.  The answer is no unless you are experienced in demonology.  However, I recommend you contact a pastor or priest before considering doing it yourself.

No. Sage for cleansing is a Native American concept and actually wakes the dead rather than cleanses.  To the church sage is considered "pagan" and should never be used for cleansing rituals.  You may be adding fuel to a growing bonfire.

This usually depends on the point of entry and matters on what you have done.  The important thing to know is that a demon cannot come against it's victims will.  This is why it causes depression and other oppressions before diabolic possession takes place.

When a demon enters a person or home it usually claims a "Right" to be there under God's law.  You break the law Satan is given certain rights to claim.  For more information read the story of Job and King Saul in the Bible.

Demons are more prone to the word of God than human spirits.  Even though human spirits are bound by the laws of God, inhuman spirits "have" to obey God's word unlike human beings who have freechoice.  Humans can either accept or deny God, while demons and angels "know" (believe) there is a God and that his word is truth.  This is all a part of Christian Apologetics. The Bible says to "Try the Spirits to know if they are from God..."  By making statements in Jesus name we can test these spirits to determine if they are human or inhuman.  If they respond negatively to "Jesus' name" then it is possible they are an unclean spirit.

Good question.  A demonologist is a paranormal researcher who only study's demons and will at times perform blessings.  Most demonologists only know certain symptoms of a demonic haunting and certain methods of blessing and cleansing.

An exorcist is usually a Christian clergyman who understands the tactics of demons.

In my case I do both the research and exorcism.