At what stage / step of development do we start to contemplate on non-self?

List below is extracted form Kimattha Sutta noting how skillful virtues lead step-by-step to the consummation of arahantship. The question is does skillful virtue require knowledge of non-self or knowledge of non-self is achieved at step 8 when one contemplate on impermanence / conditioned nature of all things including serenity and pleasure one get from virtuous act? 1. Skillful virtues 2. freedom from remorse 3. joy 4. rapture 5. serenity 6. pleasure 7. concentration 8. knowledge & vision of things as they actually are 9. disenchantment 10. dispassion 11. knowledge & vision of release 12. consummation of arahantship