At least, through 1999 - and I wouldn't think the tactics or characteristics of the demonic have changed any - here is the written sequence for the ritual of exorcism: http://www.catholicdoors.com/prayers/english/p01975b.htm
Just a "bit" more complex than when the Apostle Paul simply instructed the demon: “I command you in the name of Jesus Christ to come out of her.” And it came out that very hour."
But the CC would have us believe that only an authorized and TRAINED priest can "perform" this - guess the power is in the professional clergy and ritualistic steps - as opposed to the name and power of Christ, invoked and unleashed through the faith of a believer - ANY Believer!
Well, lets not forget that some demons are hard to get out than others and that in some cases, ONLY Christ was able to do it:
Mark 9 -
14 When they came back to the disciples, they saw a large crowd around them, and some scribes arguing with them. 15 Immediately, when the entire crowd saw Him, they were amazed and began running up to greet Him. 16 And He asked them, “What are you discussing with them?” 17 And one of the crowd answered Him, “Teacher, I brought You my son, possessed with a spirit which makes him mute; 18 and whenever it seizes him, it slams him to the ground and he foams at the mouth, and grinds his teeth and stiffens out. I told Your disciples to cast it out, and they could not do it.” 19 And He *answered them and *said, “O unbelieving generation, how long shall I be with you? How long shall I put up with you? Bring him to Me!” 20 They brought the boy to Him. When he saw Him, immediately the spirit threw him into a convulsion, and falling to the ground, he began rolling around and foaming at the mouth. 21 And He asked his father, “How long has this been happening to him?” And he said, “From childhood. 22 It has often thrown him both into the fire and into the water to destroy him. But if You can do anything, take pity on us and help us!” 23 And Jesus said to him, “‘If You can?’ All things are possible to him who believes.” 24 Immediately the boy’s father cried out and said, “I do believe; help my unbelief.” 25 When Jesus saw that a crowd was rapidly gathering, He rebuked the unclean spirit, saying to it, “You deaf and mute spirit, I command you, come out of him and do not enter him again.” 26 After crying out and throwing him into terrible convulsions, it came out; and the boy became so much like a corpse that most of them said, “He is dead!” 27 But Jesus took him by the hand and raised him; and he got up. 28 When He came into the house, His disciples began questioning Him privately, “Why could we not drive it out?” 29 And He said to them, “This kind cannot come out by anything but prayer.”
Matthew 17 -
14 When they came to the crowd, a man came up to Jesus, falling on his knees before Him and saying, 15 “Lord, have mercy on my son, for he is a lunatic and is very ill; for he often falls into the fire and often into the water. 16 I brought him to Your disciples, and they could not cure him.” 17 And Jesus answered and said, “You unbelieving and perverted generation, how long shall I be with you? How long shall I put up with you? Bring him here to Me.” 18 And Jesus rebuked him, and the demon came out of him, and the boy was cured at once.
19 Then the disciples came to Jesus privately and said, “Why could we not drive it out?” 20 And He *said to them, “Because of the littleness of your faith; for truly I say to you, if you have faith the size of a mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible to you. 21 [But this kind does not go out except by prayer and fasting.”]