Quite a long time ago, someone posted a link for getting a grid such as dunster mentions. It can be printed out, cut, and used to pin on each block. I wish I could be of more help, but someone will remember the post. I mark the first block on the row and stack each from left to right. If it's complicated or a day my brain isn't wrapped around too tight, OR a day I need the exercise, I do as WAtson does. Walk to the bed in the room across the hall, pick up two blocks, walk back and sew. When all of the row is sewed in pairs, I stack pairs left to right then walk to the utility room to press seams. etc, etc, etc.