In my yard there are several boulders whose tops are just above the ground. It doesn't look good, and it creates a small hassle when mowing. Last year I was able to remove some with a rented Toro Dingo skid steer. Some I couldn't get out though. I'm thinking of renting an electric jackhammer to remove the protruding tops of these boulders. Has anyone done this before and is able to comment on the liklihood of my being able to do this? Is it likely that I'm going to spend a lot of time and not have much to show for it? Or is it likely that I will be able to take the tops off? Please indicate if you have any personal experience using a jackhammer. Thanks for any help.