When you don’t have an extra pair of hands you make do with what you got! LOL I marked the wall where the studs were (kinda 16″ apart) and then predrilled the holes in my wall-board.
I added the trim after the shelf was up. Used a bead of wood glue again and then used my brad nailer (nail gun with 5/8″ nails/brads).
I just put up some pictures I had but will add black frames with photos I’ve taken. The two canvases are pics I’ve done.
Love them! They serve a purpose and look great! Super easy to do!