Id be happy to answer your question guys.
There are several ways to gets smooth clay.
First, turn on an easy listening jazz station, preferably with a basey voiced DJ who smothers your clay in love....it will smooth out. Well, I do this first.
Second, try a heat gun, it will heat the clay up just enough it will be easier to move.
Use all kinds of cylindrical objects: old cans, anything that has a diameter big enough that the pressure wont put a U shaped dent, but rather the rolling back-and-forth will smooth out the clay. I guess its balance between diameter of the cylinder vs. pressure applied.
Try using good old H2O, or water. Water...even a bit of spit in small places, will lubricate the surface area and keep the clay from sticking.
And my secret...if youre using oil based clay.....spray on WD40. The oil will mix with the clay and create a very smooth and easily manipulated surface...BUT BE WARNED, it can take a while for the WD40 to dissapate so youll not want to do this on a piece that requres significant detailing. Ive been thinking about cooking oil too....but if you are using a petroleum oil based clay this may or may not benefit....dunno yet.
and of course, you can make a quick mold, cast the piece, then sand....
So, there are lots of ways to accomplish the smoothing out process.
Good luck guys
Drew