Your query answered, Vidya ! Thathparyam means inner meaning. By enemy, we always think of external shathrus, only ! The internal enemies have to be conquered for our self-improvement & for others to interact happily with us ! Usually for Punyahavachanam, the veda mantras " Pavamana suktham" is chanted. Unless we learn it properly from a good teacher, we cannot do it, is my opinion ! Love & regards, Chithra.