To be specific, the self-sins are self-righteousness, self-pity, self-confidence, self-sufficiency, self-admiration, self-love and a host of others like them.  They dwell too deep within us and are too much a part of our nature until the light of God is focused upon them.  The grosser manifestations of these sins - egotism, exhibitionism, self-promotion - are strangely tolerated in Christian leaders, even in circles of impeccable orthodoxy.