I think the keys to winning people over are pretty simple, right? Kindness, authenticity, and making a good case for yourself (or whatever you're trying to persuade them on). People really don't respond well to any kind of manipulation tactic- you may find yourself winning the battle, but losing the war. I think if people can tell that you're owning a weakness in an authentic way, and then presenting a strength in an equally authentic way, that can be a good persuasion technique. However, if you're just bs'ing people to win them over, they will sense it, and you will fail.