Negotiation is a skill that can be learned easily. It helps you cope in certain circumstances. You can use negotiation techniques in sales, purchases, contracts. The most important thing is that a negotiator learns to prepare. It depends on how much you want to get what you want in the end. The more you want, the better you will prepare for the negotiation and show during the negotiation process that you are not so interested in the final result. A good negotiator knows how to plan everything efficiently and well.
All you need to do is to value your ideas and believe that you are valuable. Negotiating is not a battle, not for today or tomorrow but for your whole life. I can only challenge you to read this book as well as the others in Value Culture and wish you success!