I am sooo bad at this and my child is becoming VERY whiny when he doesn't get his way or when he wants more of something.

I've always been consistent on teaching the sign "more" but he only does it occasionally. I also try to teach the signs all done, please, milk, and eat but he won't do them consistently. He just figures it's easier to start whining to get his way... I hate it! He's a year old so I know he CAN do those things.

How do you incorporate manners into daily activities? How insistent were you that they say/sign them back to you?