I did this once as I like to understand the processes that go into modern everyday items. Without a grinding mill I wasn't able to get the cacao to the smoothest consistency (it was grainy as the article describes), however it still came out as delicious pieces of chocolate. I did not add any cocoa butter, just sugar (and not much, I like it dark).

The process of shelling, toasting, grinding, conching, and tempering wasn't as difficult as one might think; I recommend curious minds to order some beans and try it out! It makes for a fun (and tasty) afternoon.