Which ever phase I'm in at the moment - as long as it's not seam ripping! I love the thinking about and planning phase, but then once I get started I could piece for days on end and be perfectly happy. When I can get it over to the long arm, I think that's my favorite part - seeing it all come together. Then hand sewing on the binding is so relaxing. When it's all done I get to start from the beginning again and am happy about that!