Three
Tour Rookie
Yes, blue Sharpie line on the ball aligned with the point I want to hit it to.
Not sure why you wouldn't as it's still legal.
It can be difficult mentally.
Example, I don't see right to left putts well when I'm over the ball, if I aim a line on the ball at right lip, it looks like it's going left of the hole which makes it very difficult to trust in a tournament.