I must of missed those ... show me anywhere in the Bible where the apostles or Jesus cast a demon out of a NT believer.
You are literally making it up as you go along ...
Mark 1:23-27
“23 And there was in their synagogue a man with an unclean spirit; and he cried out, 24 Saying, Let us alone; what have we to do with thee, thou Jesus of Nazareth? art thou come to destroy us? I know thee who thou art, the Holy One of God. 25 And Jesus rebuked him, saying, Hold thy peace, and come out of him. 26 And when the unclean spirit had torn him, and cried with a loud voice, he came out of him. 27 And they were all amazed, insomuch that they questioned among themselves, saying, What thing is this? what new doctrine is this? for with authority commandeth he even the unclean spirits, and they do obey him. “
Luke 4: 33-35
33 ¶ And in the synagogue there was a man, which had a spirit of an unclean devil, and cried out with a loud voice, 34 Saying, Let us alone; what have we to do with thee, thou Jesus of Nazareth? art thou come to destroy us? I know thee who thou art; the Holy One of God. 35 And Jesus rebuked him, saying, Hold thy peace, and come out of him. And when the devil had thrown him in the midst, he came out of him, and hurt him not.
Mark 7:25-30
“25 For a certain woman, whose young daughter had an unclean spirit, heard of him, and came and fell at his feet: 26 The woman was a Greek, a Syrophenician by nation; and she besought him that he would cast forth the devil out of her daughter. 27 But Jesus said unto her, Let the children first be filled: for it is not meet to take the children’s bread, and to cast it unto the dogs. 28 And she answered and said unto him, Yes, Lord: yet the dogs under the table eat of the children’s crumbs. 29 And he said unto her, For this saying go thy way; the devil is gone out of thy daughter. 30 And when she was come to her house, she found the devil gone out, and her daughter laid upon the bed.”
Luke 9: 38-42
“38 And, behold, a man of the company cried out, saying, Master, I beseech thee, look upon my son: for he is mine only child. 39 And, lo, a spirit taketh him, and he suddenly crieth out; and it teareth him that he foameth again, and bruising him hardly departeth from him. 40 And I besought thy disciples to cast him out; and they could not. 41 And Jesus answering said, O faithless and perverse generation, how long shall I be with you, and suffer you? Bring thy son hither. 42 And as he was yet a coming, the devil threw him down, and tare him. And Jesus rebuked the unclean spirit, and healed the child, and delivered him again to his father.”
Acts 19:10-12
” 10 And this continued by the space of two years; so that all they which dwelt in Asia heard the word of the Lord Jesus, both Jews and Greeks. 11 And God wrought special miracles by the hands of Paul: 12 So that from his body were brought unto the sick handkerchiefs or aprons, and the diseases departed from them, and the evil spirits went out of them.”
Acts 5:14-16
“14 And believers were the more added to the Lord, multitudes both of men and women.) 15 Insomuch that they brought forth the sick into the streets, and laid them on beds and couches, that at the least the shadow of Peter passing by might overshadow some of them. 16 There came also a multitude out of the cities round about unto Jerusalem, bringing sick folks, and them which were vexed with unclean spirits: and they were healed every one.
Acts 16:16
“16 ¶ And it came to pass, as we went to prayer, a certain damsel possessed with a spirit of divination met us, which brought her masters much gain by soothsaying: 17 The same followed Paul and us, and cried, saying, These men are the servants of the most high God, which shew unto us the way of salvation. 18 And this did she many days. But Paul, being grieved, turned and said to the spirit, I command thee in the name of Jesus Christ to come out of her. And he came out the same hour.”
Now, for modern-day casting out of demons/devils by Christians:
Win Worley: Tactics for deliverance, Beginners
https://www.youtube.com/watch?v=yN4mV7C2kEw
Note: If you, or the person wanting demons/devils/unclean spirits cast out is not a born-again Christian, the Bible gives an example of what may happen here:
Acts: 13-18”13 ¶ Then certain of the vagabond Jews, exorcists, took upon them to call over them which had evil spirits the name of the Lord Jesus, saying, We adjure you by Jesus whom Paul preacheth. 14 And there were seven sons of one Sceva, a Jew, and chief of the priests, which did so. 15 And the evil spirit answered and said, Jesus I know, and Paul I know; but who are ye? 16 And the man in whom the evil spirit was leaped on them, and overcame them, and prevailed against them, so that they fled out of that house naked and wounded. 17 And this was known to all the Jews and Greeks also dwelling at Ephesus; and fear fell on them all, and the name of the Lord Jesus was magnified. 18 And many that believed came, and confessed, and shewed their deeds. “
I do not believe that you are a Christian, and so recommend strongly that you do not attempt this. You do not wish to run out of your house naked and bleeding, I am sure.