Can I treat silver clay pieces just like sterling after they are fired?
Mostly. You can polish, file, bend, drill and solder silver clay. You need to remember that silver clay is fine silver, while sterling is an alloy of silver and copper. Fine silver is a little softer and doesn’t work harden in the same way as Sterling. Your silver clay pieces are strongest if fired in a kiln, so if you intend to bend the piece after firing (like forming into a ring shape) it is best to use a kiln. Torch or stove-top firing is perfectly adequate for most items.