Here are two simple life hacks from Nonviolent Communication (NVC) which can lead to less conflict and increase your chances of getting what you want.
When asking someone for something, consider what you will do if the the person you ask says “no”. If you have a Plan B, you are much more likely to hear the “no” without getting angry.
When asking, try saying “Would you be willing to ….?”. This makes it easier for the other person to say “no”, which in turn leads to less resentment and conflict. Also, many of us will resist if wwe here anything that sounds like a demand and we’re actually more likely to say “no” in that situation.