It's just a matter of decision and "Regret".
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The Lord Jesus Christ does not need to prepare himself, he is now willing and eager to receive us just as we are and in the way we are right now.
37 When they heard this, they were pricked in their hearts, and said to Peter and the rest of the apostles, Men and brothers, what shall we do? 38 Peter said to them, Repent, and be baptized every one of you in the name of Jesus Christ for the forgiveness of sins, and you will receive the gift of the Holy Spirit. 39 For the promise is to you and to your children and to all who are far off, as many as the Lord our God will call. 40 And with many other words he testified and exhorted them, saying, "Be saved from this perverse generation." 41 So those who received his word were baptized, and about three thousand souls were added that day.
Acts 2:37-41