It depends on my mood and on how complicated the block is. If it's a new block, I often make a tester block just to verify the design and cutting instructions. Does it have matching points? Does it require a scant vs. regular seam allowance? etc. Then I like to break the project into the individual steps. Cutting all the bits and stacking them in order. Sewing all the pieces one step at a time. For very complicated blocks, I usually work them start to finish on each block. I have gotten things turned around in strip-piecing so I am now more careful.