If it helps, locate the tag on the fitted sheet (assuming there is one). Once you find out which orientation is correct, burn into your memory where the corner with the tag is, then always start with that corner.
While you have the fitted sheet on the bed correctly, take a vibrant thread and needle. And stitch a little something on the corner or the elastic area. Pick one corner and do it to all the fitted sheets. Maybe pick a corner you will remember? It helps the sheets get done much faster, because I too have the same issue! Same with the USB things! I always pick the wrong end first