Being made worthy of Jesus and The Resurrection is called sanctification. In the early stages of sanctification as faith in Jesus and knowledge of His teachings and apostles' teachings leads to the disciple putting an end to major unworthy behaviours such as lying and hating, the onus may be on the individual to take due heed to the word of Christ's testimony of truth. This may happen during evangelism and can typically be by one-to-one or one-to-many preaching. After the first "bath" (as Jesus put it) in the words the need is more a matter of finer grained and deeper cleansing of sanctification and this is to involve other disciples. The picture given is foot washing. Here is where church fellowship enters the picture. "Wash one another's feet." It is a matter too for prayer; "if you see a brother sin you should pray and God will give him life.
