5. Take care of yourself
Look after yourself in every situation. You should keep in mind that you will sometime fail to reach a win-win solution. No guarantee that you will reach a win-lose solution either!
The most important quality is respect. Surely, no matter what happens, respect yourself and people you're dealing with.
Please do not forget that you're not the only person who has the right to express his views and opinions. Let other people be themselves. Do not get upset if other people get overly emotional. Be strong enough to agree with other opinions and be ready to put up with various attitudes.
Being a wise person requires patience, time and plenty of efforts. If you do not give up on people and yourself, you will soon know how to deal with other people’s negative feelings and emotions.