when I first started to work with clay I had a lot of trouble working with my reclaimed clay. Tons of air bubbles. Follow the general steps of letting clay totaly dry, then cover in water. I let mine site for several days to a week. If there is any shape left I just let it sit. I scoop it out on to a plaster batt covered with an old tshirt. As it sits I will walk by occasionaly and pat it into a shape with the tshirt around it. The one thing is to not let it get to dry. I wedge when it is as soft as possible. I then let it sit for a day or two to firm up a little more before throwing. Remember that everything you do to the clay will dry it a little more. I find the drier it is, the harder to throw. I laugh because the first clay I ever bought was so dry it was like sand paper grinding down my hands and I had to use tons of water to throw with. Hope this helps.