Never advance to the battlefield with empty hands and no provisions. Before you decide to go ahead negotiate, you need your own standards or desires on the outcome of the negotiations. In addition, there are other important things that preparation of data and facts that can support your argument.

Establish a number of reasons / why you want A. then do some deep research to make your argument difficult to argue with.

Just imagine, if you make a proposal or request in a negotiation but you yourself are confused what the reason, whether the opponents can negotiate just follow your will?