About hand signals: you aren't supposed to point, exactly, because pointing relates to some separate, specific reference, while the signals are supposed relate to oneself, for universal reference. They're supposed to be something you wouldn't do for any other reason, and they're not supposed to look natural. For a stop, you're supposed to show your palm, and for turns, you're supposed to show the back of your hand, in both cases with your thumb and fingers all straight and together. Also, the more orthogonal your arm position, the better. It's when you sort of vaguely flop your arm out, wiggle your hand or curl your fingers and point that people start getting confused; dorkiness provides clarity.