He should try to keep himself steady, without committing any sinful actions. The primary sinful activities are described, and we try to follow. And if we chant sixteen rounds and keep ourself always aloof from the sinful activities, then it is certain, niścayāt, utsāhān dhairyāt, niścayāt tat-tat-karma-pravartanāt, sato vṛtteḥ sādhu-saṅge ṣaḍbhir bhaktiḥ prasidhyati.
If you want to advance in devotional service, then you should be enthusiastic, utsāhān, dhairyāt, with patience, and niścayāt, you should be assured that "Because I'm following strictly the direction of my spiritual master and śāstras, certainly I shall meet Kṛṣṇa." Tat-tat-karma-pravartanāt. By following the rules and regulations, sato vṛtteḥ, always trying to be honest and sādhu-saṅga... (CC Madhya 22.83). The sādhu-saṅga is very important.