Name the corners A, B, C, and D, clockwise around the sheet with A as the upper left and A-B forming a long side of the sheet.
Tuck corner A into corner B, so the one is nested inside the other. Then, avoiding twisting the sheet, tuck corner D into corner C similarly. Then, tuck corner AB into corner CD. You should now have a rectangle that will lie fairly flat. Fold it up like you would fold a flat thing.
Name the corners A, B, C, and D, clockwise around the sheet with A as the upper left and A-B forming a long side of the sheet.
Tuck corner A into corner B, so the one is nested inside the other. Then, avoiding twisting the sheet, tuck corner D into corner C similarly. Then, tuck corner AB into corner CD. You should now have a rectangle that will lie fairly flat. Fold it up like you would fold a flat thing.
That does sound easier. Thanks!