Firstly, zee goats blood must be no older zan three days! And no trying to skimp by on aromatherapy candles, only blood-red scentless candles vill vork!
Secondly, please double check to make sure your sacrifice is actually a virgin. There's no telling vhat zee one on zee other side will think if it ISN'T a virgin, eh?
Finally, no kitchen knives EVER! Only use the ritual sacrificial dirk or dagger! You wouldn't summon your significant ozher to bed whilst brandishing the wrong tools, now, vould you?
(This message brought to you by the great taste of entrails. Entrails: They're full of fun protein and bacteria!)
I know how I'd throw it. With pressure activated SemTex plastic-explosive hoof-covers! Yeah! Then we'd have tons of fresh hamburger meat!
Or make the cow try a rocket-jump ala Unreal Tournament.