I broke my thumb between a rock and a rock and a hard place last summer.
I have been there, done that! It doesn't take a big rock to smoosh your finger into hamburger meat! I thought my fingernail was NEVER gonna grow back.
I use a backhoe to move my big rocks around, but I saw an episode of that gardener guy on HGTV use a big dolly that had a curved back to move rocks. And, he flipped them into place using a long steel pry bar as a lever and a piece of stone as a fulcrum. I used the pry bar method one day when I got tired of waiting on the backhoe guy, and it worked like a charm!
Moved a BIG flat rock from one end of the yard to the other...flip, flip, flip...etc. (Then I moved it back. I have a hard time making important decisions!)
Cindy