Most of my handbuilding begins with making slabs of clay. I don't like making slabs, so I tend to make a number of them at one time, layering them between sheets of plastic and sheetrock. The plastic keeps the clay from drying out and the sheetrock from getting moldy. I have a small slab roller but find the best work comes from handmade slabs. Today the UPS man delivered a huge rolling pin, which should help.
Once I get a couple good-sized slabs made, I am quite happy to spend the entire day making things, stopping only when I run out of slabs or my back gives out from standing in the same position all day.