Measure twice, cut once. That’s what they say.
What do they know?
I say measure no times, then go ahead and put that nail in the wall. Wherever it feels right.
Hang the picture.
Realize it’s too far to the left.
Pull the nail out and put it back in the wall about a centimeter to the right. (It’s very important that you do not measure. We don’t want to know if this is an actual centimeter).
Hang the picture.
Realize it’s too far to the left still.
Consider whether it will look intentionally askew.
Stand back. Cock your head to the side.
Give up and measure.