If you do 1/4 inch seams and have to cross them, you can stab stitch through that area and maintain the length of stitch that you desire. I am doing one of those embroideried squares stitched together for another person and the woman left the 1/2 inch allowance after stitching them together and pressed them to one side, so on some corners, I have 4 layers to go through and the only way there is to do one stitch at a time, poking down through and then stabbing back up to the top.