This is a huge problem for me too. It is why my quilting goes so slowly. Take two blocks and sew them. Put them back on the quilt in progress to make sure they are right. Take two more blocks, etc. No chain piecing for me - I always end up turning them the wrong way. I have a scrappy carpenter star. I laid it all out. Took a picture. And, when I thought it was together, well, it wasn't. Had to take most of it apart. I confuse myself with pins, etc. I guess I am a work in progress!