Do vision boards actually work?+
As reminders that keep a goal visible, yes, and visibility matters more than people expect. As a way of attracting the pictured things, no. The women for whom boards clearly work are the ones who attached actions to the images.
Where should I hang it?+
Somewhere you pass without planning to — the wardrobe door, the wall opposite the kettle, the inside of a cupboard you open daily. Not above the bed, where it becomes part of the furniture within a week.
How many images is too many?+
Past about ten the board stops being readable in one glance and becomes texture. Six to eight with air between them holds attention much longer than a full collage does.
Is New Year the right time to make one?+
It is a popular time, not a required one. A board made in a quiet week in March often lasts longer, because it comes from a real decision rather than from the general mood of the season.