In personal life/career we do have adversaries/opponents/enemies etc. Its a part and parcel of our life. How do we overwhelm them?
In Indian texts, we often quote saama, dhaana, bedham and dandam. Meaning 4 C's
Coax, Contribute, Confuse and confront.
COAX: Just praise them even though he/she may not deserve those encomiums.
CONTRIBUTE: Offer them with luxurious gifts make sure you 've "immersed them in your hospitatility.
CONFUSE: If you can't convice them atleast confuse them. In other words, create a fissure in their camp thereby you can encash the situation.
CONFRONT: This is the last resort, some people are headstrong by nature. They only understand the language of force.