After the first one or two 'test' blocks I like to somewhat assembly line sew - but in small batches. So I might do six blocks at a time which moves things along but still gives a nice feeling of satisfaction upon completion. It also changes up the activities so I don't get bored/sore doing the same thing for too long. The only exception is cutting the pieces - if there are a lot of different fabrics involved, then after the test blocks, I cut everything out so I can pick and choose which part to work on next without having to layout/square up all the fabrics every time.