Before bharanyasam, one must have the yearning and prayers for a successful fructification in terms of being associated with a preceptor. These are the thoughts one must hold on to before bharanyasam.
After bharanyasam, one must follow many prescribed matters; especially association with demigods and bhagavata apacharam are to be strictly avoided at all costs. The reason that we adhere to these standards (those that need to be embraced and those that must be avoided) are for the pleasure of Emperuman. Emperuman is pleased if we follow the ordains of the scriptures; so one must avoid food that is unworthy of consumption and one must avoid eating food from outside. One can worship Divya Desam-s, their favorite sthalam-s, and ancient temples but avoid visiting temples of demigods.