Dealing with difficult or aggressive negotiators can be challenging, but with the right approach, you can still navigate the negotiation process effectively. Some strategies to handle such situations:

• Stay calm and composed.
• Listen actively.
• Empathise with their concerns.
• Set boundaries.
• Stick to facts and data.
• Be assertive.
• Collaborate and find win-win solutions.
• Take breaks if necessary.
• Bring in a mediator if needed.
• Be prepared to walk away.
• Learn from the experience.

Remember, negotiation is a skill that improves with practice. Stay confident, adaptable, and willing to learn from each negotiation experience.