One should not think that Krishna is an ordinary man. If you think like that then you do not know anything about Krishna. Avajananti man mudha manusim tanum asritah . . . (BG 9.11). "Fools deride Me when I descend in the human form. They do not know My transcendental nature and My supreme dominion over all that be." All the mudhas or rascals consider Krishna to be an ordinary man, but He is not ordinary, He is the Supreme Being. Where do you get this information that Krishna is an ordinary man like us? In no Vedic Literature is it said that Krishna is an ordinary human being. In the Brahma-Samhita it is said: Isvara Parama Krishna . . . He is described as the Supreme Being. I do not know on what authority you can say that Krishna is an ordinary human being like you or me?
Sacrifice does not mean murdering. The real work is yajna. Yajna means Visnu. In the Bhagavad-gita, yajna is prescribed. Yajnarthat karmano 'nyatra loko 'yam Karma-bandhanah . . . (BG 3.9). "Work done as a sacrifice for Visnu has to be performed, otherwise work binds one to this world." Yajna is prescribed in Vedic literature. Yajna means satisfying Lord Visnu. Lord Visnu's another name is Yajna-purusa. One must satisfy Him anyway that He likes. "Patram puspam phalam toyam yo me bhaktya prayacchati . . . (BG 9.26). If one offers Me in devotion a leaf, flower, fruit or water, I will accept it." Not that whimsically offer.
You also mentioned that how can I give up attraction for woman; when you learn to love Krishna, then you can forget your lusty desires for women. Krishna's another name is Madan-Mohan. When Krishna is within the heart, then the Madan or lusty desires become defeated. If we learn to love Krishna, our lusty desires will be finished, otherwise not.