If you've only spun a rod bearing and suffered no other damage, you might be able to get by simply replacing the damaged bearing shell.

Remove spark plugs and drop the oil pan, then turn the engine by hand with a socket on the crank pulley to bring each conrod cap down to an accessible point, see if you can determine which one is loose wiggling by hand. If not, remove one cap at a time to inspect the bearing shells. When you find the damaged bearing shell, feel around that crank journal as well to verify it hasn't been scraped/gouged, should feel perfectly smooth all around.