Be cheerful and happy when you meet others. A nasty first expression on the face can ruin your impression for a very long time and its ridiculously hard to fix. No matter what situation you are in, if you are going to present yourself as positively energetic, you never know, you might just light up the room.
I don't know about you but when i meet someone i already know and they don't recall my name, my heart skips a beat. That's my identity, and if that's not important enough to remember, i don't know what is. Address people properly and don't forget to say their name every time you get a chance. Its important.
When you are wrong, stop going around in circles trying to manipulate your way out of that, Admit it. Its probably not easy but its the quickest most error free way to get out of it. Not just that, realize your mistake and commit in your heart to never do it again. It will elevate your status in other's eyes.
Being a leader means, pointing out people's mistake and making them correct it and then they hate you for doing that. To avoid the hate part, go for improving remarks rather than pointing the mistake out, actually keep it a secret and lose the focus on the fault. That will get you results and the liking.
Never embarrass the people you lead. In any and every situation, find a solution in the moment that will make them walk away with pride and confidence. Mold their mistakes to make them see the light at the end of the tunnel. With encouraging remarks, prove it to them how easy it is to get back on track.