Lay them out on a cookie sheet or large tray arranged exactly as they should be sewn. It makes it so much easier to keep them in order if you can see how the block is supposed to look when finished, and on a cookie sheet you can keep it near you so you don't have to keep jumping up and down to get the pieces. If it's too crowded on your sewing table consider using a TV tray for your cookie sheet so you can move it closer or further away as needed.