When I hung my runners, I used clamps to hold them in place, then "tacked" them in place with a screw before drilling thru both the runner and post with a cordless drill and auger. It is much easier to drill a slightly larger hole than your bolt, such as 1/2" hole for 3/8" bolt, so that you don't have to drive the bolt thru the hole with a hammer. I found that a ship auger worked better than a drill bit. I hung all the runners around the perimeter and the all the joists useing the clamp method, and did most of the work single handed.