[LazyPup]

The easiest way i have found to drill those holes is to make a drilling jig to allign your drill.

To make the jig you will need a piece of plywood about 2 inches longer than the width of the board you want to drill, and about 2 inches wider than the spacing between to pegs from top to bottom.

On one end of your jib board attach a strip of wood about and inch wide. make sure it is straight with the end of your board and screw it in place.

You can then turn your jig board upside down with the strip on the edge of the board you want to drill.

Carefully lay out two hole about 1/2inch from the edge of your jig and drill through the jig board and into the finish board.

You can now insert wood pegs or a couple spare bolts down through the jig board into the finish board to hold the jig in place.

lay out two more holes on the other edge of your jig, perfectly in line with the first two hole, and spaced the width your need between pegs going up your shelf board.

Drill those two holes, then slide your jig up and insert the pegs in those two holes and use the other holes in your jig to guide your drill.

keep sliding the jig up using the pegs to hold it in one set of holes as you drill the next. When or done, all the holes will be equallly spaced.