This is my no fail system to hanging shelves, pictures, and anything else that goes on the wall.
I take a piece of paper or two the size of whatever I’m hanging. tape it together.
I mark the holes on the piece of paper. I usually have to line up the paper so that it’s straight. I use a screw driver or a pencil. Whatever I have on hand.
I tape up the piece of paper where I want it to go, and then I start hammering or screwing the holes in the wall. I have to hand screw these ones. which was a pain in the BUTT. I’m using my sears gift card of this bad boy.
See, then you have the papers attached to the walls and the holes in the right spot.
Hang your shelf. And then pull the papers out from under the shelf.
Perfect straight little girls vanity for Liv.
I did the same exact thing for her dress up hanger.
I hope this helps and I hope it works! When I figured this out, I haven’t gone back to “guessing” since! :) Mostly, I just feel really awesome that I can hang things without my husbands help. I swear, he busts out the graphing calculator, string, a yard stick and whatever else to hang up stuff for me. He probably 100% straight. but whatever.