Here's four qualities of successful negotiators you might try to develop. Successful negotiators always have clearly defined goals, and are ready to both substantively and emotionally negotiate. Before meeting, write down your current workload and know exactly how much more you can take on. Effective negotiators get everybody on board first. They don't try to ram things down people's throats.
Effective negotiators find ways around hurdles.
Every negotiation has moments when it doesn't appear the parties will ever get together. You have to get past those hurdles. Look for trade-offs based on what's cheap for you and valuable to the other side. Work to reshape the deal so everybody wins. Effective negotiators are willing to walk away.