Originally Posted by JCDerrick

Originally I thought I'd have to pound the top using a hammer, but I carefully used the weight of the bar to my advantage. I wiggled a starting hole, and then lifted and dropped the bar back onto the same hole. It takes a little accuracy to hit the same spot again and again, but once you get in, you're good. The weight of the bar will sink further into the soil and slice through things as you raise and drop it (even from an angle). Kinda like digging a post hole - just have to keep dropping into the same spot.