Place sheet on bed for size and fold the corner outside. Place pins down the fold. Take sheet off and turn inside out then sew along fold. The next step is to trim the extra fabric off and use blanket stitch to finish seam. repeat on each corner.
They sell the precut stringers at the big box hardware stores and treads. Watch you tube videos on how to install wooden stairs. That will give you direction.
New install or existing install?
Thank you William, New.
Inside or outside. There are codes that regulate the height of risers and depth of treads.
THANK YOU FOR THE EXCELLENT INFO.