"Begone beginning" can be replaced with several synonyms that portray the start or commencement of something. The word "onset" suggests the beginning of something unpleasant, like an illness or an attack. "Commencement" is often associated with formal events, like graduation ceremonies. "Inception" refers to the beginning of a particular concept or idea. "Genesis" is a synonym that is commonly used to describe the beginning of life or creation. "Outset" refers to the starting point of a particular activity or process. Finally, "prologue" is a literary term used to describe the introductory section of a play or novel. Using these synonyms can add variety and nuance to your writing when discussing the beginning stages of something.