Prepare and Plan
 Find mutual ground
The mutual goals of all parties involved should be the primary focal point. Negotiation skills pivot upon effectively keeping the focus of the entire negotiation centred on the mutual goals of all parties, and how your suggestion or service is able to satisfy or in minimalist terms oblige their needs and goals. In a competitive or corporate environment it is then specifically important how your company is able to do this better than any of the competitors who are able to provide the same satisfaction.
 Be logical
 Deal with yourself
If you are unable to be critical of yourself, the best thing you could do is to get a friend or family member to screen your proposal or offer. To do this effectively you should let them pretend to be the other party while you present your proposal, and ask them to react honestly and critically so that you will be prepared for anything that the client party could possibly throw at you.
These are simple strategies, but they are extremely effective business negotiation skills.