daf bit: Yoma
The kohein gadol (high priest) performs his most important duty on Yom Kippur, when he enters the holy of holies and makes expiation for the people. (Well, did when the temple stood.) It's really important to get it right. But remember that the position of kohein gadol is inherited, not based on merit. The position calls for respect but not a presumption of expertise.
Seven days before Yom Kippur the kohein gadol was taken from his home to a special chamber with counselors, and a backup priest was made ready in case anything happened to the kohein gadol. They brought elders who spent the week reviewing or teaching him the order of the service. On the eve of Yom Kippur they placed him at the gate so he could watch the animals being brought and see how they are offered. During the week they did not withhold food and drink from him, but near nightfall on the last day they would not let him eat lest it make him sleepy. They then took him to the place of the service and respectfully pleaded with him to not change anything of what they had taught him. If he was a sage he would expound and if not the disciples present would do so, and then he or the disciples (depending on his ability) would read scripture: Job, Ezra, and Chronicles. If he started to nod off they would wake him and keep him amused until it was time for the morning offering. (2a, 18a, 18b, 19b)
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Are you sure about this? IIRC, the kohein gadol wasn't always the son of the previous one...